A physical barrier that separates a population
in half and that leads to the evolution of a new
species is called
a. sympatric speciation.
b. allopatric speciation.
c. directional selection.
d. ecological isolation.
e. behavioral isolation
B
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What will be an ideal response?
A farmer decides to plant his crops in a desert. What adaptation would give them the greatest advantage in this climate?
A. C3 photosynthesis B. symbiosis C. mycorrhizal association D. C4 photosynthesis E. mycoheterotrophy
All of the following will help slow the rate of increase of atmospheric CO2 except:
A. All of the answer options will help slow the rate of increase of atmospheric CO2. B. using solar power instead of fossil fuels to help conserve finite natural resources. C. using nuclear power to reduce the cost of energy production. D. driving more fuel-efficient cars. E. turning off the light in an empty room.
The structure labeled "B" is the ____
a. right ventricle b. right atrium
c. left atrium d. left ventricle e. superior vena cava