In all vertebrates with four-chambered hearts, the ________ receives oxygenated blood directly from the ________.
A. left ventricle, left atrium
B. left ventricle, lungs
C. right ventricle, right atrium
D. right ventricle, lungs
E. left atrium, left ventricle
A. left ventricle, left atrium
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Which of the following exert bottom-up control?
A. a parasite that resides in a mammal's gut B. a tertiary predator with fluctuating population size C. levels of calcium and nitrogen in the soil D. a disease-carrying protist
Chimpanzees are considered to be our closest extant relative because
A. they have prehensile tails. B. their genome is 99% identical to the human genome. C. their upper/lower limbs equally account for bearing the body weight. D. they have flat, spreading noses. E. they are a highly social species.
Copy number variants
A) are extremely rare, occurring in only about a dozen sites in the genome. B) are found only in even-numbered chromosomes. C) number in hundreds to thousands. D) are five or fewer bases long.
The physical expression of these alleles in an individual is called the _______.
Fill in the blank(s) with the appropriate word(s).