Populations are held in check by
a. resource partitioning.
b. predation.
c. social parasitism.
d. competition.
e. any of these.
Answer: e
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This animal is acoelomate, hermaphroditic, and
adds new segments to its body as it grows. This animal is ___.
a. a planarian b. a tapeworm c. a fluke d. an earthworm e. more than one of these
A sterile mule is produced by mating a horse and a donkey. this is an example of _______ reproductive isolation.
A. prezygotic B. allopatric C. sympatric D. outgroup E. postzygotic
The flow of which of the following ions makes the largest contribution to the resting potential?
a. K+ b. Na+ c. H+ d. Ca2+
Which of the following statements about mutations is false?
A) Mutations are essential to variation within species. B) Multicellular organisms evolve faster than unicellular organisms. C) A mutation in a single-celled organism is more likely to be passed to daughter cells than a multicellular organism. D) Mutations are essential to evolution within species. E) A mutation is a change in the genetic material of a cell or virus.