Ciliated gills in clams, sharks continuously swimming with their mouths partly open, countercurrent flow of blood and water in fish gills, and the use of air sacs to effect unidirectional flow of air through bird lungs are all adaptations that optimize what factor in the formula for Fick's law of diffusion?
A. A
B. d
C. ?p
D. D
Answer: C
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One secondary spermatocyte ultimately produces ____ mature sperm
a. one b. two c. three d. four e. eight
Figure "B" in the above pair is a
a. cotyledon. b. petiole. c. dicot; evergreen. d. veins.
Which of the following conditions would tend to make the Hardy-Weinberg equation more accurate for predicting the genotype frequencies of future generations in a population of a sexually reproducing species?
A) a small population size B) little gene flow with surrounding populations C) a tendency on the part of females to mate with the healthiest males D) mutations that alter the gene pool
How are excretion and defecation alike?
A. Both eliminate waste from the body. B. Both involve the colon. C. Both involve the kidneys. D. Both are carried out by the urinary system. E. Both are carried out by the digestive system.