The community effect of oil pollution is
a. increased biomass.
b. reduced diversity.
c. longer food chains.
d. increased trophic complexity.
e. greater stability.
B
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In a cell-mediated immune response, how does a helper T cell activate cytotoxic T cells?
a. antibodies b. cytokine signaling c. receptor signaling d. via cross-talk with macrophages e. neural signaling
Eugenics is the attempt to improve the human species by ____________________. Fill in the blank(s) with the appropriate word(s)
Darwin made which observation while on his four-year voyage on the HMS Beagle?
A. More individuals of a population are born than survive to reproduce. B. Populations grow constantly. C. Organisms are varied and some variations are inherited. D. An individual's chance of survival is random. E. Species do not appear to change over time.
Mycology is the study of
A) mycoplasma. B) mushrooms. C) protozoa. D) molds. E) molds, yeast, and mushrooms.