Charles Darwin's theory of natural selection can best be summarized as:
a. The best adapted individuals survive and the weakest die young
b. Populations don't evolve, individuals do.
c. Variety among individuals in a population is due more to environmental influence than heredity.
d. The best adapted individuals produce more offspring so gradually the population comes to resemble them.
d
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Which of the following statements concerning
fertilization in ferns is true? a. It occurs outside the egg-producing structure. b. It requires water. c. The fertilization product is haploid. d. A spore is the product of fertilization. e. None of these are true.
Which of the following is not a member of
Osteichthyes? a. teleosts b. ray-finned fish c. lungfish d. stingrays e. lobe-finned fishes
Stereocilia are long, stiff, microvilli that are present on the hair cells of ________
Fill in the blank(s) with correct word
You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. B. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. D. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates. E. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates.