What causes the existence of superficial differences among groups of humans?
A) temporal isolation
B) geographic isolation
C) genetic incompatibility
D) behavioral isolation
B
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Water obtained from seawater desalination is much cheaper than water pumped from the ground
Indicate whether the statement is true or false
The portion of the DNA molecule that is translated is composed of
a. introns. b. anticodons. c. exons. d. transcriptions. e. exons and transcriptions.
Which biome receives an average of 2 meters of rain per year and has a dense, leafy canopy of trees?
a) tropical rain forest b) boreal forest c) tropical dry forest d) temperate deciduous forest
Histamine, serotonin, and bradykinin are all
A. vasoactive mediators. B. mediators that increase chemotaxis. C. mediators of T-cell activity. D. fever inducers. E. mediators of B-cell activity.