Directional selection favors
a. intermediate phenotypes.
b. phenotypes at one end of the distribution.
c. phenotypic extremes at both ends.
d. heterozygotes.
e. homozygotes.
B
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In reviewing historical records and ice core data, researchers noted that atmospheric CO2 levels started to rise as humans began to burn fossil fuels. This is an example of what type of relationship?
A. correlation B. symbioses C. causation D. antagonism E. conduction
Why are scientists separating the protists into several different groups?
What will be an ideal response?
Photorespiration
1.is another name for the Calvin cycle. 2.will happen in wet climates. 3.happens when the plant requires energy. 4.happens when oxygen levels are high in leaf tissue. 5.happens when carbon levels are high in leaf tissue.
Which of the following is part of the growth phase of
the male gametophyte generation? a. carpel b. anther c. pollen tube d. seed e. megaspore