Blood enters the kidney through ____ and
leaves the kidney through ____.
a. the renal vein; the renal artery
b. the nephron; the renal capillary
c. the renal artery; the renal vein
d. the renal artery; the nephron
e. none of these
C
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What is the primary source of energy for nearly ALL of the earth's ecosystems?
Which of the following describes why Mendel used the pea plant to study inheritance?
a. The pea plant grows quickly, so he was able to see results faster than with the other organisms he had studied. b. The monastery where he lived prevented him from studying inheritance in animals. c. The plant naturally self-fertilizes, which results in “true-breeding” individuals. d. Flower petal color is the only characteristic that can change from generation to generation, making it simple to study.
Sperm are produced in the:
a. testes b. vas deferens c. epididymis d. prostate gland e. penis
Species interactions between members of a
community include __________, which is helpful to one species and does not harm the other species. Fill in the blank(s) with the appropriate word(s).