Three factors that help return blood to the heart are ___________
Fill in the blank(s) with the appropriate word(s).
Ans: respiratory pump, muscular pump, and sympathetic venoconstriction
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Sediments that are formed from seawater as a result of a variety of chemical processes are called:
a. cosmogenous. b. hydrogenous. c. organic.. d. biogenous. e. terrigenous.
Primary consumers are found at
a. the lowest trophic level. b. the highest trophic level. c. the second trophic level. d. all trophic levels. e. the third trophic level.
Where is the thymus gland located?
A. on top of the kidneys B. in the chest C. in the neck D. in the brain E. near the ovaries/testes
_________ is the flow of alleles in and out of a population as a result of the migration of individuals or gametes
A. Natural selection B. Mutation C. Genetic drift D. Gene flow