Many lines of evidence suggest that human populations aren't distinct races. Why are we so similar even though adaptations to local conditions have occurred?
A) Members of different populations mate with each other.
B) Natural selection has acted in the same way for all groups of humans.
C) Populations mate assortatively.
D) Sexual selection has acted in the same way for all groups.
A
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Macrophages are phagocytic cells.
Answer the following statement true (T) or false (F)
The plural for genus is
a. genus. b. geni. c. genera. d. gena. e. genae.
Which organism would be most likely to be able to survive rapid global climate change?
A. a bird that lives north of the Arctic Circle B. a salamander that inhabits high elevations C. a fish species that depends on coral reefs for food and shelter D. a tree species with bird-dispersed seeds E. an insect that can feed upon many different plant species
Given that most ligands form covalent bonds with their associated receptors, these complexes are more or less permanent and can only be broken through the hydrolysis of ATP.
a. true b. false