The effectiveness of geographic barriers in
promoting speciation is related most to
a. the size of the barrier.
b. the inability of the organisms to overcome
the barrier.
c. the speed at which the barrier forms.
d. how long the barrier exists.
e. the size of the population it separates
B
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Use the sum rule to determine the probability of either event X or event Y occurring if they cannot
occur simultaneously. (In the equations below, Px means probability of event X; Py means probability of event Y.)
a. = Px + Py b. = PxPy c. = (Px)2 + (Py)2 d. = (Px + Py)2 e. = Px 2Py 2
Biologists think that the first photosynthetic cells
a. used water as an electron donor. b. were the first living cells to develop. c. lived more than 2.8 billion years ago. d. released hydrogen into the atmosphere. e. required oxygen rather than carbon dioxide.
Some terrestrial plants use bicarbonate (HCO3-) as a carbon source for photosynthesis
Indicate whether the statement is true or false
Genes
What will be an ideal response?