The ultimate fate of the energy used by organisms is to
a. be converted into heat.
b. be converted into offspring.
c. be recycled repeatedly without loss.
d. be used as metabolic heat.
e. move into the environment by conduction.
A
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An acoelomate is an animal that
A. has a coelom. B. has a pseudocoelom. C. has both a coelom and a pseudocoelom. D. has neither a coelom nor a pseudocoelom. E. has a coelom during early development but later loses it.
Which of the following are the two major abiotic factors that shape terrestrial biomes?
a. precipitation and temperature b. temperature and soil c. organisms and climate d. precipitation and soil
Land vertebrates evolved which of the following to
help maintain water balance? a. circulatory system b. thyroid c. kidneys d. liver e. none of these
Before photosynthesis evolved, ________ was rare in Earth's atmosphere
A) O2 B) CO2 C) H2O D) N2 E) air