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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

Some terrestrial plants use bicarbonate (HCO3-) as a carbon source for photosynthesis

Indicate whether the statement is true or false

Biology & Microbiology

Genes

What will be an ideal response?

Biology & Microbiology