As compared to the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of
A. complete separation between oxygenated and deoxygenated blood.
B. a single circuit.
C. a pocket of the gut that serves as an air bladder.
D. partially separate circuits for gas exchange and systemic delivery of blood.
E. a four-chambered heart.
Answer: D
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Nephrons:
A. extend from the cortex into the medulla. B. are located entirely within the cortex. C. are located entirely within the medulla. D. are located within the renal pelvis. E. None of these answer options is correct.
We can see only a small portion of the entire electromagnetic spectrum.
a. true b. false
Which of the following is not part of the theory of natural selection?
A) Individuals in a population vary. B) Some variation can be passed on to offspring. C) Populations produce more offspring than the environment can support. D) All species are descended from a common ancestor.
Fungal infections are difficult to treat because
A. they mutate very rapidly and therefore become resistant to most medications. B. fungal and human cells are so similar that it is difficult to make fungal medications that do not harm human cells. C. they "hide out" inside of cells, and have long latent periods where medications can not get to the organism. D. All of the answer choices are correct.