The colonization of land by animals:
A. preceded the presence of plant species on
land.
B. took place billions of years ago.
C. was made more easy by high atmospheric
levels of carbon dioxide.
D. may have taken place independently by a
variety of species descended from aquatic
environments.
D
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A chemoorganotroph and a chemolithotroph in the same environment would NOT compete for
A) oxygen. B) carbon. C) nitrogen. D) phosphorous.
Thyroid hormone is to amphibian metamorphosis as ________ is to insect molting.
A. estogen B. aldosterone C. ecdysone D. cortisol E. butterfly peptide
What is most closely associated with membrane-attack complexes (MACs)?
a. complement proteins b. helper T cells c. B cells d. histamines e. cytokines
Copper is an example of a major mineral
____________________ Indicate whether the statement is true or false.