In some species of flowering plants, pollen
from unrelated species may germinate on the
female stigma, but the pollen tube grows only
a short distance and fertilization does not
occur. This is an example of ___ isolation
a. species
b. temporal
c. behavioral
d. ecological
e. mechanical
E
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Species richness is greatest at which latitude?
a. 60 degrees north b. 60 degrees south c. 0 degrees d. 40 degrees north e. 20 degrees south
Mothers with small children often do not seem to hear their noisy children. This is an example of:
a. imprinting. b. habituation. c. classical conditioning. d. operant conditioning. e. insight learning
The bond between oppositely charged ions is a(n) ________ bond
A) ionic B) polar C) hydrogen D) covalent
Darwin referred to a gradual change from an ancestral type as
A. Fossils B. Uniformitarianism C. Descent with modification D. Special creation E. Natural selection