The Great Dane and the Chihuahua are both domestic dogs (the same species), but mating between them is limited because of
A) hybrid infertility.
B) hybrid inviability.
C) geographic isolation.
D) mechanical incompatibility.
E) behavioral isolation.
D
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Which of the following is true about temporal variation in community biomass?
A. It cycles faster in communities with low species richness. B. It increases with increases in species richness. C. It decreases with increases in species richness. D. It cycles faster in communities with high species richness. E. It is usually low because community biomass is very stable over time.
The heart of amphibians has __________ chambers. The hearts of birds and mammals have
__________ chambers. a. two; three b. three; four c. two; four d. three; five e. three; two
Medullary breathing centers directly sense and respond to
A) blood pH and CO2 concentration. B) blood O2 concentration. C) alveolar O2 concentration. D) blood pH and O2 concentration.
Water has surface tension because ...
What will be an ideal response?