Dr. Robert Hazen has worked to develop a hypothesis that explains
the origin of life on Earth. His work has focused on hydrothermal vents, which are cracks in the ocean floor. Water heated by molten rock beneath the crust escapes from these vents at very high temperatures, producing hot, high-pressure environments at the vents on the ocean floor.
In order to provide evidence that these vents may be areas where life originated, which of the following states a null hypothesis Hazen might have used to begin his research?
(A) Organic molecules were transported to the hydrothermal vents via a meteorite, thereby seeding them with precursors for more complex molecules.
(B) The temperatures and pressures found in hydrothermal vents resemble conditions described in currently accepted origins of life hypotheses.
(C) Organic waste sinking to the ocean floor would have used the unique hot water environment as an energy source to begin manufacturing food.
(D) Chemosynthetic organisms can best develop in the hydrothermal environment, manufacturing nutrients for other living things to feed on.
Answer:
(B) The temperatures and pressures found in hydrothermal vents resemble conditions described in currently accepted origins of life hypotheses
Explanation:
We are told that Dr. Hazen wants to develop a hypothesis that explains
the origin of life on Earth.
Now, he focused on hydrothermal vents. That Water heated by molten rock beneath the crust escapes from these vents at very high temperatures, producing hot, high-pressure environments at the vents on the ocean floor.
This means the null hypothesis will be temperatures and pressures found in this initial condition he described while any other different from it will be the alternative hypothesis.
Looking at all the given options and comparing with the initial hypothesis conditions in the question, the correct answer is option B.
The origin of life can be seen as the natural process in which the origin of living things happen through non-living matter or smaller organic compound.
The null hypothesis is:
(B) The temperatures and pressures found in hydrothermal vents matches the conditions described in currently accepted origins of life hypotheses.
The null hypothesis for Dr. Robert Hazen hypothesisThe hypothesis says that hydrothermal vents are cracks in the ocean floor.It also states that there were high temperatures and high pressure environment.Thus, the option (B) The temperatures and pressures found in hydrothermal vents matches the conditions described in currently accepted origins of life hypotheses is the best null hypothesis for Dr. hazen to begin his research.
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suggest two features of humans that are cause by their genes, and are not affected by their environment
Answer:
body temperature,mental ability is high in humans
Explanation:
in 1975 the population of Peary caribou among the artic islands was around 28000. in 1976 there were 16000 death and 900 birth and no immigration or emigration. Calculate the population change as a percentage.
Answer:
peary caribou
Explanation:
Which is the SI symbol for volume?
X m
g
L
к
Answer:
L
Explanation:
will give branliest answer pls help !!
Answer:
Codominance
Explanation:
That would be Codominance. Codominance means that neither allele can mask the expression of the other allele (Both are dominant alleles, no recessive alleles). This is because the flower isn't only red or only pink. It has both alleles (which causes the red and pink stripes).
Complete a model to explain the molecular events occurring at each stage of this reaction profile. Rank the stages from the first to the last one.
The substrate molecules are entering the cells, so no product is made yet As the substrate is used up, the rate decreases (the slope is less steep)
The line is flat because no new substrate remains and thus no new product appears
There is sufficient substrate, so the reaction is proceeding at a maximum rate
Section A Section D
Answer:
The substrate molecules are entering the cells, so no product is made yet.
There is sufficient substrate, so the reaction is proceeding at a maximum rate
As the substrate is used up, the rate decreases (the slope is less steep)
The line is flat because no new substrate remains and thus no new product appears
Explanation:
First the substrate molecules enters in the cell and no product is produced because the reaction is not started yet. When the reaction starts, the substrate is in large amount while on the other hand, the amount of product is low. As the reaction proceed forward, concentration of substrate is lowering and concentration of product is increasing. When all the substrate used up, so no new product is formed.
Based on the Resource Use and Conservation Virtual Lab, Which tactic can do the most to keep the water debt less than the water supply?
A. Outlawing water features in gardens
B. Replacing drip irrigation systems
C. Outlawing drip irrigation systems
D. Replacing thermal power plants.
Answer: D. Replacing thermal power plants.
Explanation:
Thermal Power Stations are some of the biggest users of water in the world because water is integral to producing electricity in them. These stations burn fossil fuels like coal which then vaporizes water so that it becomes steam which then drives turbines that produce electricity.
Water is also used for cooling high temperatures produced.
If these thermal stations are replaced with something that uses less water, it will go a long way in keeping the water debt less than the water supply.
Some Monerans are decomposers . Which BEST describes these Monerans ? Help
Answer:
The answer is D.
They all live in or on a living organism.
Explanation:
These bacteria are special since they live in some of the most harsh habitats such as extreme. The majority are important decomposers.
Hope this helps you!
mention 10 most plant families in the world
10 most plant families in the world are÷
1)plant families-Iridaceae.
2)plant families-Asteraceae
3)Plant families – Scrophulariaceae.
4)Plant families – Saxifragaceae.
5)Plant families – Rosaceae
6)Plant families – Euphorbiaceae.
7)Plant families – Lamiaceae.
8)plant families-Rubiaceae
9)plant families-Orchidaceae
10)plant families-Fabaceae
What two types of precipitation are called minor precipitation?
Answer:
Dew and frost are considered minor precipitation.
I think ;)
Three cells that each has a diploid number of 32 go through mitosis. How
many
cells result and how many total chromosomes are in each cell?
Answer: 6 diploid cells, each with 32 chromosomes
Explanation:
Mitosis ptoduces two diploid daughter cells. Six cells result, each with 32 chromosomes
In fruit flies, a dominant gene, G, codes for the trait of gray body color. A recessive gene, g. codes for black body color. Two fruit flies mate to
produce offspring
GG
Gg
Offspring
Which prediction about the offspring's body color is based on the properties of genetic reproduction?
O A The offspring can only express the trait of gray body color.
OB. The offspring can only have genes for the trait of gray body color.
O c The offspring can express either the gray or the black body color trait
O 0. The offspring are equally likely to have genes for the gray or black body color trait.
The prediction about the offspring's body color is based on the properties of genetic reproduction, it can only express the trait of gray body color. The correct option is A.
What is the dominant and recessive gene?Recessive and dominant genes. Dominant/recessive interactions are the most frequent type of allele-allele interaction. When one (dominant) allele of a gene effectively outweighs the other (recessive) allele, the allele is said to be dominant.
Blood types and eye color are two instances of dominant/recessive gene interactions. Due to recessive inheritance, the disease can only be brought on by a pair of faulty genes. Carriers are individuals who have only one faulty gene out of the pair.
Therefore, the correct option is A. The offspring can only express the trait of gray body color.
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Please help I’ll give brainliest to whoever’s right
Answer:
1:Gravity acts on all masses equally, even though the effects on both masses may be different because gravity causes all objects to fall at the same constant rate of 9.8 m/s2. An object in free fall means that the only force acting on the object is gravity
2:Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
3:A scientific theory is an explanation of something in the natural world that is based on past observations and evidence.
4:In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
Explanation:
Identify the phase of the moon labeled C that would be seen from the earth labeled B
Answer:
The correct answer is - a lunar eclipse (total lunar eclipse).
Explanation:
When the sun and moon align opposite one another and earth between them and blocks the light of the sun to reach the moon known as a lunar eclipse. A lunar eclipse can be a partial or total lunar eclipse.
A partial lunar eclipse occurs when a part of the earth covers the moon to get the light or between the sun and the moon. The total lunar eclipse occurs when the whole moon is opposite to the sun and earth between them.
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All of the following statements about classification are true EXCEPT which of these.
O A) Scientists classify things based on their characteristics.
OB) Scientists classify things to help stay organized.
O C) Scientists classify things to make more work for themselves.
OD) Scientists classify things based on color, size, and shape.
Select the two correct statements. Select the two correct statements. All proteins will show different degrees of divergence because different species exhibit different patterns of behavior and have different metabolic pathways. All proteins will show the same degree of divergence because all cellular functions are essential to the survival of the organism.
Complete question:
Comparisons of amino acid sequences can shed light on the evolutionary divergence of related species. If you were comparing two living species, would you expect all proteins to show the same degree of divergence? Select the two correct statements.
All proteins will show the same degree of divergence because they are modified with the same rate of evolution. All proteins will show the same degree of divergence because different species experience the same selection pressure. All proteins will show different degrees of divergence because different species live in different habitats and experience different selection pressure.All proteins will show different degrees of divergence because different species exhibit different patterns of behavior and have different metabolic pathways. All proteins will show the same degree of divergence because all cellular functions are essential to the survival of the organism.All proteins will show different degrees of divergence because some cellular functions are more essential than others to the survival of the organism.Answer:
3) All proteins will show different degrees of divergence because different species live in different habitats and experience different selection pressure.
4) All proteins will show different degrees of divergence because different species exhibit different patterns of behavior and have different metabolic pathways.
Explanation:
All proteins will show the same degree of divergence because they are modified with the same rate of evolution. FALSE. All proteins will show the same degree of divergence because different species experience the same selection pressure. FALSEAll proteins will show different degrees of divergence because different species live in different habitats and experience different selection pressure. TRUE All proteins will show different degrees of divergence because different species exhibit different patterns of behavior and have different metabolic pathways. TRUEAll proteins will show the same degree of divergence because all cellular functions are essential to the survival of the organism. FALSEAll proteins will show different degrees of divergence because some cellular functions are more essential than others to the survival of the organism. FALSE.In this example, we are comparing different species, although we do not know how different they are. Changes in the proteins reflect the divergence between groups during evolution. Among different animals and plants, changes in proteins and their following maintenance can be associated with a group divergence and evolution.
The same proteins amino acid sequences in different species provide information about the divergence point between both species. Probably, the origin of genes and protein changes and the subsequent fixation of those changes by natural selection is the cause of most of the phenotypic variation observed between species. So, genes and proteins are subdued to selective pressures that vary according to the environment and the species.
In populations of the same species inhabiting different places with different environmental characteristics suffer changes that respond to their life habits. Proteins evolve in different degrees and take different routes, influenced by the selective pressures of the environment surrounding them. Ecological, behavioral, reproductive pressures, among others, vary between populations according to their own needs and produce changes that "model" the organisms when fixating. These changes are inherited generation after generation, leading to a divergence in the species.
How is light harnessed by plants?
Answer:
chlorophil
Explanation:
pollution in the____will have the greatest effect on human health.
Answer:
TROPOSPHERE
Explanation:
pollution the TROPOSPHERE will have the greatest effect on human health.
Which contains mostly hydrocarbons?
carbohydrates
proteins
salt
gasoline
Answer:
gasoline
Explanation:
hope that is help you haha
Answer:
gasoline
Explanation:
what are two important processes that occur during the prophase?
Answer:
In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.
Explanation:
Please help whoever’s right I’ll give brainliest
Answer:
organism
system
tissue
organ
cell
Explanation:
Answer:
Any living thing with one or more cells - Organism
This is a group of interdependent organs with similar functions - System
This is a group of cells with similar structure of function - Tissue
A group of tissues working together to perform a similar function - Organ
This is a structural and functional unit of all living organisms... - Cell
Explanation:
Can you help me please
Answer:
what is the question? please give more details
Explanation:
Which of the following facts supports the argument that a pregnant cow should be fed more in its last trimester?
The placenta is formed by the end of the first trimester
The heart beats and organs are formed during the first trimester.
Teeth and fur develop during the second trimester.
Three-quarters of all growth occurs during the third trimester.
Answer:
Three-Quarters of all growth occurs during the third trimester.
Explanation:
D is the only option that has anything to do with the last trimester which is what the question was asking about. Furthermore, because so much growth is occurring during this time the cow will need more food to support this growth. So, D is the best option.
origin of life of the theory of endosymbiosis
Answer: The theory of endosymbiosis means that eukaryotes(plants and animals) formed from prokaryotes (bacteria and archaeabacteria).
Explanation:
what did Mendel call genes?
Answer:
heredity factors
Explanation:
Limestone form as ocean water evaporates and leaves calcium carbonate behind, which is the deposited in the seabed. What type of rock can be formed this way?
Answer:
Sedimentary rock.
Explanation:
Limestone form as ocean water evaporates and leaves calcium carbonate behind, which is then deposited in the seabed. Thus, the type of rock that can be formed this way is a sedimentary rock.
The texture of inorganic land-derived sedimentary rocks is fragmental or clastic. Sediments come from land to form inorganic sedimentary rocks.
Some examples of inorganic land-derived sedimentary rocks are conglomerate, brescia and sandstone.
You need a service dog to help someone in a wheelchair.What traits would you want the dog to have? Why?
You would have the dog for retrieval, pushing buttons, and possibly depending on the dog puling the wheelchair.
Retrieval because they can't get stuff off the ground, pushing buttons because they might not be able to reach and pulling the wheelchair if the handler has a medical episode and can't do it themselves.
Chlorofluorocarbon molecules are environmentally significant because
a.their chlorine atoms can destroy many stratospheric ozone molecules.
b.they are poisonous, flammable, and corrosive to metals.
c.their absorption of lethal solar energy protects Earth.
d.they readily break down ozone molecules produced as pollution
Answer:
their chlorine atoms can destroy ozone molecules
Explanation:
the ideal temperature at which to study the effect of proteases
Answer:
the answer is 37°C.
Explanation:
The ideal temperature at which to study the effect of proteases on protein is 37°C. Why are higher temperatures not advisable? This could result in an irreversible denaturing of the protein.
Why do you think more than 54% of u.s wilderness areas are located in alaska and only 2.7% of land area in the lower 48 states is protected as wilderness, most of it in the West?
Answer:
because the west isn't as densely populated as the east and alaska is exremely remote and not densly populated
Explanation: