The first step in the development of living organisms was the formation of
A) DNA.
B) organic molecules from gases in the atmosphere.
C) enzymes.
D) inorganic molecules from elements in the ocean waters.
E) simple sugars.
B
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According to the multiregional model,
a. Homo erectus populations migrated out of Africa. b. Homo erectus evolved further in regions beyond Africa. c. Homo erectus populations gave rise to races of Homo sapiens. d. Homo sapiens subpopulations originated in several separate locations. e. all of these are true.
Species A prefers a more dry habitat but grows in a wet habitat. Why might this be?
A) Species B outcompetes A in the dry habitat. B) Species A's fundamental niche is restricted to a wet habitat. C) Species A requires large amounts of moisture to grow. D) Species B prefers a wet habitat.
The proportion of phenotypic variance that results from additive genetic variance is known as ________ heritability
A) broad-sense B) narrow-sense C) multifactorial D) generic E) genetic
Chemicals released by macrophages that cause the onset of a fever are called ________
Fill in the blank(s) with correct word