Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
what 2 factors will the selectively permeable cell membrane use to select what can enter or leave the cell? I wrote size but what else?
Which of the following is NOT an example of evidence that supports the theory of evolution?
A. common genetic ancestors among diverse species
B. fossil evidence suggesting ancient genetic ancestors
C. unnecessary or nonfunctional organs in modern species
D. fossils of the same species found diverse geographic locations
The statement that is not an example of evidence that supports the theory of evolution is fossils of the same species found in diverse geographic locations.
What do you mean by Evolution?Evolution may be defined as a gradual and continuous process that runs over many generations, during which species of animals, plants, or insects slowly change some of their physical characteristics.
Common genetic ancestors may be diverse into the number of other species due to the theory of evolution. Unnecessary or non-functional organs may be eliminated or shortened due to evolution.
Therefore, the statement that is not an example of evidence that supports the theory of evolution is fossils of the same species found in diverse geographic locations.
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______and____ are early tetrapods that do not have features unique to fish. Describe how these two species differ antaomically and what that means about where they each live.
What reflex kicks in if your epiglottis reflex malfunctions?
Answer:
The coughing reflex kicks in, only if the epiglottis reflex fails to. If the coughing reflex fails then the Heimlich maneuver may be needed.
3. Are vaccines available to prevent HIV and cancers?
(3)
How is RNA different from DNA?
A. DNA is double stranded, contains uracil, sugar is ribose
B. DNA is single stranded , contains thymine , sugar is deoxyribose
C. RNA is single stranded, contains thymine , sugar is ribose.
D. RNA is single stranded , contains uracil , sugar is ribose
Answer:
D. RNA is single stranded , contains uracil, sugar is ribose
Answer:
D. RNA is single stranded , contains uracil , sugar is ribose
Explanation:
RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose
Which substance is a compound?
water
gold
oxygen
hydrogen
ITS WATER I SWEAR
H20 has multiple elements in it so its a compound the others are just single elements
PLEASE giv brainliest
HELP ILL GIVE BRAINLIEST!!! Genetic variation led to to one plant surviving and reproducing when the other did not. This variation was in... *picture also attatched
Answer:
D
Explanation:
What are some characteristics of ecotourism in Africa?
Answer:
A few of the ecotourism features are the traditional practices, encouraging interaction between visitors with the local villages to increase sale of handicraft items, the promotion of cultural dance, music as well as hiring local workers to maintain the lodge
An outer waxy, waterproof coating on plants.
Which of the following individuals is true-breeding for all traits? A. RrYY B. RRYy C. RRYY D. RrYy ellus Corporation. All Rights Reserved.
The true breeding individual for all traits is RRYY.
What is True breeding ?A true-breeding organism, sometimes also called a purebred, is an organism that always passes down certain phenotypic traits to its offspring of many generations. This means that the parents are homozygous for every trait.
Since RRYY is homozygous for all traits, it will be a true breeding organism if crossed over with another RRYY organism. This is because all the off-springs produced from this cross will also be RRYY that is purebred.
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How would the author of "Are 'Green' Cars Really All That Green?" dispute the claim in "Cars Without Gasoline Are Here" that biofuels are a good replacement for fossil fuels?
Answer:
A. By noting that biofuels come from vegetables such as corn and sugar beet.
Explanation:
The author claims that biofuels are a good replacement for fossil fuels in the vehicles because it produced less carbondioxide gas as compared to fossil fuels. The biofuels also produced pollution but less as compared to fossil fuel. This biofuel is extracted in the form of Bioethanol which is a type of alcohol made by fermentation process of starch crops such as corn, sugarcane, or sweet sorghum. This biofuel made from biological materials that decrease the production of carbondioxide gas.
What is the term for a strong response to a harmless antigen in the environment? Notice the word Harmless in the question.
a. inflammatory response
b. an autoimmune disease
c. cell-mediated immunity
d. an allergy
The term "net energy” refers to the amount of energy available from a resource minus the amount of
energy needed to make it available.
a. True
b. False
Answer:
True
Explanation:
Which phyla have well developed nervous system
Explanation:
Cnidarians
.............
Organisms that live in the tundra have developed unique adaptations that aid in their survival. Ursus maritimus has a variety of adaptations which enable it to survive in the tundra. It is the largest terrestrial carnivore, but it is also an excellent swimmer that spends much of its time in and near the water hunting its favorite food. It has large paws with small bumps to provide traction as it walks across the ice. Its fur is helpful as camouflage during the winter months, but not as helpful during the summer. Which organism has the adaptations described that enable it to survive in the tundra
Answer: The organism that has the adaptations described that enable it to survive in the tundra is the POLAR BEAR.
Explanation:
ADAPTATION is defined as the process by which an organism becomes fitted to its environment thereby enabling the organism to live successfully and reproduce.
In any population, an organism is able to survive if it has features that help them to fit and compete successfully in that environment.
From the question, a typical example was given concerning the POLAR BEAR (Ursus maritimus) and it's best fitted environment which is the tundra.
The tundra is a type of biome that is treeless marshy vegetation which is composed mainly of dwarf shrubs. It's has a cold climate (Arctic region) with long icy winters and very short summer with an average temperature of 10°C.
Ursus maritimus has a variety of adaptations which enable it to survive in the tundra. These adaptations include:
--> The presence of a thick coat of insulated WHITE FUR: this helps it to survive the cold environment by acting as an effective insulator. The fur is also found at the base of its large paws with small bumps, which protects it against cold surfaces and provides its with a better grip of ice as it walks across it. It also gives it a concealing coloration making it unnoticed while it stalks its prey in the snow. These are the features that enables it survive the terrestrial environment if tundra.
--> it also has some aquatic adaptations which enables it to hunt it's favourite food which is seals. The presence of large front paws which are slightly webbed allows them swim for a long distance in search of food.
Answer:
c polar bears
Explanation:
got it right edg 2021
Although animal nervous systems differ in complexity, their nerve cells are still remarkably similar. true false
Answer:
TRUE
Explanation:
The nervous system only exists in animals. Neurons are the nerve cells that compose the nervous system.
The neuron´s principal function is to catch stimuli from the exterior convert them into nerve impulses that get transported to the control centers. These control centers interpret the signal and send an answer to the stimuli.
The control centers in invertebrates are ganglia, while the vertebrate´s control centers are the spinal medulla and the encephalon.
The signal transport occurs from cell to cell in inferior animals and through nerves in superior animals.
There is a progressive increase in the complexity of the nervous system. It evolved from primitive animals to the most superior ones. This evolution is especially noticeable in the development of the encephalon as the control center.
However, the basic nerve cell is very similar in all animals.
HELP ME
Explain how physical variation is expressed in human beings and how it relates to cultural groups and ethnicity?!??
hat are the two possibilities for Fred’s genotype?BRAIN 10 POINTS
Answer:
11%2F6_ -Amoeba Sisters Video Recap and Practice Problems.docx
Explanation:
#maxmeasabrainliestdimples (D) is dominant; no dimples (d) a man who is heterozygous for dimples marries a woman who has no dimples. the genotype of the man would be?
Answer:
the genotype of the man would be Dd
Explanation:
Heterozygous means having to different alleles (ex. Ff) so the mans genotype would be Dd
What is the biggest difference when comparing a prokaryotic and a eukaryotic cell?
Answer:
Well, the primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. ... Prokaryotes, on the other hand, have no membrane-bound organelles. Another important difference is the DNA structure.
Answer:
The biggest difference between the two are that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not.
What type of dominance is it when BOTH alleles for a trait are expressed in offspring?
Recessive
Incomplete dominance
Codominant
Complete dominance
Answer:
Codominant
Explanation:
Which molecules are used for releasing energy in the cell
1. glucose, carbon dioxide and water
2glucose, oxygen and amino acids
3glucose and oxygen
4glucose and amino acids
Answer: glucose and Oxygen
Explanation: Glucose is converted to water and carbon dioxide in mitocondries and energy is released. Oxygen is needed to reaction.
Amino acids can be converted to energy but that is not primary purpose of amino acids.
Suppose you coated the leaves of a plant with petroleum jelly. How would the plant's rate of transpiration be affected?
Answer:
The rate of transpiration would decrease
Explanation:
the petroleum jelly would block the stomata of the leaves resulting in decreased transpiration rates
Petroleum jelly would inhibit the loss of moisture out of the stomata cells. Therefore, the rate of transpiration would be decreased.
What is transpiration?Transpiration exists the procedure of water movement via a plant and its evaporation from aerial parts, such as leaves, stems, and flowers. Water exists essential for plants but only a small amount of water brought up by the roots is utilized for growth and metabolism. The remaining 97–99.5% exists lost by transpiration. An example of transpiration exists when a plant absorbs water in its roots.
Hence, Petroleum jelly would inhibit the loss of moisture out of the stomata cells. Therefore, the rate of transpiration would be decreased.
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Lipids contain instructions for creating proteins and are passed from parents to offspring.
Select one:
True
False
is plasma the liquid portion of blood?
Answer:
Plasma is the liquid portion of blood. About 55% of our blood is plasma, and the remaining 45% are red blood cells, white blood cells and platelets that are suspended in the plasma.
Explanation:
Answer: Plasma is the liquid portion of blood.
Explanation: About 55% of out blood is plasma, and the remaining 45% are red blood cells, white blood cells and platelets that are suspended in the plasma.
Don’t understand need help
Answer:
I think c
Explanation:
I took the quiz but I m not sure
Which of the following would not be considered a microhabitat?
a
a rotting log
b
an ant hill
c
the Amazon rainforest
d
your back yard
Answer:
D. your backyard
Explanation:
A microhabitat is a small area which differs somehow from the surrounding habitat. Its unique conditions may be home to unique species that may not be found in the larger region and the backyard does not relate to this definition
Roots do all of the following, except ______.
A. absorb water
B. anchor plants in the ground
C. photosynthesis
Answer:
C. photosynthesis
Explanation:
The main function of roots is to transport water and nutrients to the plant, photosynthesis happens in the chloroplast.
Animals with which type symmetry 'conquered' the land?