Which structure in the heart'separates
oxygenated blood from deoxygenated blood?
Answer:
pericardium
Explanation:
A double-walled membrane, the pericardium, separates the right and left chambers, preventing oxygen-rich blood from mixing up with the one without oxygen. So, the heart functions go smoothly. Deoxygenated blood enters the right atrium.
Which factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection?
(1 point)
1. a change in the diet of human populations as they settled in colder climates
2. the clothing worn by humans in the early 8th century
3.the interaction of human populations with predators in colder climates
4.the impact of UV radiation on folate and Vitamin D levels in human populations
Answer: The answer is 4
Explanation:
Vitamin D controls your skin pigment. It's kind of like when someone has an iron deficiency they get bruises and they turn a whiter shade.
Hope I helped :)
The factors that were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection are the impact of UV radiation on folate and Vitamin D levels in human populations.
Ultraviolet B radiation produces diet D in human skin. Ultraviolet radiation can, however, smash folate. Folate is critical for the speedy increase of cells, particularly at some point in which its deficiency can motivate neural tube defects. The human frame additionally has a mechanism to save you overproduction of vitamins.
What is UV radiation?Ultraviolet is a shape of electromagnetic radiation with a wavelength from 10 nm to four hundred nm, shorter than that of seen light, but longer than X-rays. UV radiation is found in sunlight and constitutes approximately 10% of the whole electromagnetic radiation output from the Sun.
Thus it is learned that the above answers are well-explained factors that were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection bout.
To learn more about natural selection refer to the link :
https://brainly.com/question/23929271
What does hydroelectric power do?
a.) causes thermal pollution
b.) requires building dams that can harm ecosystems
c.) uses the energy inside an atom's nucleus to generate electricity
d.) releases carbon dioxide into the air
Answer:
B Requires building dams that can harm ecosystems
Answer:
b
Explanation:
How does competition affects behavior of species
Answer:
The way organisms compete with each other determines species distributions, population dynamics, community structure, food webs, and social dominance hierarchies. ... These stressors affect the way that organisms compete with each other and their ability to survive and co-exist.
Explanation:
The __
__from farmland is often contaminated with pesticides, herbicides,
fertilizers, and oils used in farm equipment.
A. ammonia buildup
B. runoff
C. livestock
D. acid rain
Answer:
B. Runoff
Explanation:
BIOLOGY PLEASE HELP 15PTS AND BRAINLIEST
What three processes take place in the digestive system?
Answer:
digests food, absorbs released nutrients, and excretes food components that are indigestible.
can someone show Me how you do Math on The periodic Table no links or I will report you
Answer: I won’t put a table link don’t worry
Explanation: “Table Link” Nice nice nice
6. How might protein synthesis execute differently if a mutation occurs?
Answer:
The wrong protein can be created or the right one with abnormal function.
Explanation:
The mutated DNA is taken through the whole protein synthesis process and translated by the rRNA and tRNA to create a protein from that new sequence.
What is friction А a force that slows an object down B a force that speeds an object up ca force that makes an object start moving Da force that can move very heavy objects
Answer:
.V.JHRM.TLNGOYIG
Explanation:
Answer:yo am cool lol
Explanation:
Which is not something that scientists help doctors do?
diagnose disease
treat disease
cause disease
prevent disease
Describe three major ways humans use land
Answer:
they built farms buildings and broke the tree for roads
Explanation:
explain how all the layers of earth are necessary to create life on the surface
Answer:
The layers of Earth provide geologists and geophysicists clues to how Earth formed, the layers that make up other planetary bodies, the source of Earth's resources, and much more.
Explanation:
Hope it helped!
A farmer often sprays a certain kind of insecticide, a chemical that kills insects, on his plants to prevent locust bugs from eating all of his corn crops. One day there was a random change in the sequence of DNA in a locust egg cell. When the egg cell hatched, the locust was resistant to the insecticide (it would not be killed by it). Since that locust could survive and reproduce, natural selection occurred until the entire population evolved to become resistant.
A) Identify the variation that existed in the insect population. _________________________________
B) Identify the process that created this variation. _________________________________
C) Explain why the variations in the insect population would be passed on to the next generation.
D) Is this locust population likely to survive, why or why not?
Answer:
as they were living in that environment they adopted it and were able to in it ; the population was able to survive because they adopted it
Snowshoe hares live in areas with cool summers and extreme winters. In the summer, their fur is brown. In the winter, they grow white fur. Which best describes what this is an example of?
A) adaptation
B) evolution
C) selection
D) variation
Answer:
A) Adaptation
HELPS ASAP!! How do the retinas of the eyes of night hunting amimals differ from the retinas of animals that hunt during the daytime.
They have more rod cells
They have fewer cone cells
They have more cone cells
They have fewer rod cells
The answer is they have more rod cells
1. Describe the classical scheme of gene expression from DNA to RNA to protein.
2. Explain DNA replication and recombination.
Answer:
1. The central dogma of molecular biology is DNA >>transcription>> RNA >>translation>> protein
2. DNA replication refers to the genetic process of generating two identical DNA molecules from one DNA sequence. Recombination refers to the exchange of genetic material (DNA) between non-sister chromatids during cell division (meiosis)
Explanation:
Gene expression (also known as transcription) is the process by which a specific fragment of DNA called gene is used as template to synthesize an RNA molecule, usually a messenger RNA (mRNA), which is in turn used as template to create a protein. This final product (i.e., the protein) has an effect on the phenotype of the individual. The DNA template is a single-stranded ordered polynucleotide chain composed of four different types of nitrogenous bases: Adenine, Thymine, Guanine and Cytosine. In the complementary RNA molecule, Thymine bases are replaced by Uracil bases. Moreover, DNA replication refers to the process by which cells duplicate their genetic material before cell division (either mitosis or meiosis). During this process, both DNA strands are separated and each one is used as a template to synthesize a new DNA molecule. Finally, recombination or crossing over is a process where non-sister chromatids exchange genetic material during meiosis I (Prophase I). Recombination is known to increase genetic variation in resulting meiotic cells.
Which of the following statements about lichens are true?
Answer:
The photobiont supplies the association organic carbon from photosynthesis, and the mycobiont ensures protection and regulates the supply of minerals and water. The nutritional exchange between partners is probably much more complex than exchange of water and minerals for organic carbon. Thus, the correct answer is option B.
Answer:juegan maincra
Explanation:porque si
What is being done about plastic pollution?
Answer:
people are caring there own utensils or a wooden spork and avoid using plastic utensils. Review restaurants and cafes and recognize them when they avoid straws and plastic packaging – and let them know you want them to do better when they don't. Use reusable water bottles, coffee mugs, and bags.
Explanation:
What is the answer to this question?
Answer:
DDDDDDDDDDDDDDDDDDDDDDDDDD
Answer:
The answer is C.
Explanation:
This is because for A, this statement says nothing about corundum being yellow which means that this doesn’t apply and is incorrect. For B is pretty much the same as A, this statement about corundum doesn’t say anything about it being able to flavor or being flavorful. Lastly for D, the fact that corundum is hard means it would be impractical and probably impossible to use it as pencil lead because, all lead it doing with a pencil is being crushes and ground into the paper as you write.
Hope this helps.
If a woman who is heterozygous for type B Blood, has a baby with a man who is heterozygous for type B blood, what are they chances their baby could have type O blood?
Answer:
50%
Their are 50% chances for their baby to have type O blood.
Sometimes an organ can be replaced by moving it from one part of the body to another. This can be done, for example, to replace damaged skin or joints. In these cases: rejection of the transplanted organ would not be expected. antibodies would be generated against the transplanted organ. antigens would be generated against the transplanted organ. immunosuppressant drugs would be required to prevent transplant rejection. rejection of the transplanted organ would still be expected.
Answer:
rejection of the transplanted organ would not be expected.
Explanation:
Organs can be defined as specialized body tissues united to perform specific functions in living organisms. Some examples of organs found in humans are brain, bladder, kidney, heart, intestine, eyes, lungs, liver, etc.
In the field of Medicine and Surgery, an organ is sometimes replaced for specific reasons, by moving it from one part of the body to another; this process is generally referred to as a transplant. Thus, it's mainly done to replace damaged skin or joints in the body of a living organism such as humans.
Hence, in these cases, rejection of the transplanted organ would not be expected because an examination and matching of the organ is carried out by the medical professionals before transplant.
c3ll therory state that all living things are composed of cells, and are the basic units of life. Why do scientists refer to it as cell theory instead of cell hypothesis?
A Since we haven't checked every organism for ourselves, we cannot call it hypothesis.
B It explains what happens in cells, so it cannot be a hypothesis.
C All of the evidence collected supports the idea of why we believe this
D It is an idea that is held by more than just one scientist
PLZ help i will give you Brainliest
Explanation:
https://brainly.com/question/22853579
What effect would building a highway have on an ecosystem?
A) increase in butterfly migration
B) Decrease in destruction of a habitat
C) Increase in carbon dioxide
D) Increase in oxygen
Answer:
C
Explanation:
Building a highway destroys an ecosystem/habitat, so not b. With the ecosystem destroyed there will be a reduced number of trees that produce oxygen, so not d. Now you make an educated guess. If there is a large highway there will be a lot of cars which produce lots of carbon dioxide. No butterflies.
Answer:
Increase in Co2
Explanation:
More vehickes mpre Pollution
where do I place echinodermata on the phylogenetic tree
Answer:
QUESTION:
where do I place Echinodermata on the phylogenetic tree?
ANSWER:
Echinoderms include starfish, sea urchins, sand dollars, and feather stars. Echinoderms are found in many different ocean environments, but most are found in reefs.
Explanation:
Hope that this helps you out! :)
If you have any questions please put them in the comment section below this answer.
Have a great rest of your day/night!
Please thank me on my profile if this answer has helped you.
What human behavior was the cause of the Nipah virus outbreak in Bangladesh? How did scientists determine this?
Answer:
Humans drinking raw date palm sap was the cause of the Nipah virus outbreak in Bangladesh. Scientists found Nipah virus in bat excretions and discovered that bats were contaminating date palm juice with their excretions (saliva, urine).
Explanation:
Nipah virus can spread to people from:
1) Direct contact with infected animals, such as bats or pigs, or their body fluids (such as blood, urine or saliva).
2) Consuming food products that have been contaminated by body fluids of infected animals (such as palm sap or fruit contaminated by an infected bat).
How can alleles show incomplete dominance?
Answer:
a gene, does not completely mask the effects of a recessive allele, and the organism's resulting physical appearance shows a blending of both alleles. It is also called semi-dominance or partial dominance.
Explanation:
Place the labels accordingly to Biotic or Abiotic factors of this ecosystem.
(answers)
Answer:
abiotic: sea, air, rock, sun ,sea water.
biotic : shrimp , bacteria ,whelk ,
sea anemone, plankton, fish.
Explanation :
Biotic factors relate to all the living things in the ecosystem.
abiotic refers to all the non-living factors present in an ecosystem. Sunlight, water, land, all constitute the abiotic factors.
Bone remodeling is a function of what cell?
Answer:
a)Osteoclasts
b)Osteoblasts
Explanation:
a) destroys the bone matrix
b) have osteogenic functions
Bone remodeling is a function of cell - Osteoclast, and osteoblast
Bone remodeling is a lifelong process where mature bone tissue is removed from the skeleton called bone resorption and new bone tissue is formed called ossification or new bone formation.
the removal of mineralized bone by osteoclastsafter removal of mineralization, the formation of the bone matrix through the osteoblastsprocess of bone remodeling also called bone metabolism is regulated by keeping maintenance between bone formation and bone resorptionThus, the correct answer is - Osteoclast and osteoblast.
Learn more about:
https://brainly.com/question/2261162
Which of these is a distinguishing characteristic of a temperate grassland?
A. Giraffes, zebras, and wildebeests
B. Warm weather all year long
C. Low annual precipitation
D. Deep, fertile soil
Answer:
A. Giraffes, zebras, and wildebeests
Explanation:
Answer:
Its actually C
Explanation:
Which material heats fastest, the rock, the sand or the water?
Explain your answer.
Answer:
Sand
Explanation:
Sand heated up faster than water because sand is darker than water; dark-colored materials will absorb more light. Sand heated up faster than water because sand is a solid and water is a liquid. Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. Water has to lose more energy than the sand (dry land) in order for the temperature to decrease.