The primary root of a seedling grows down
a. to avoid light.
b. in response to gravity.
c. because the cells on the upper surface of the
root elongate more rapidly than those on
the lower surface of the root.
d. in response to different concentrations of
auxin.
e. because of all of these except "to avoid
light."
E
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The copulatory organ of the earthworm is the
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The membrane attack complex is involved in specific immune defense mechanisms.
Answer the following statement true (T) or false (F)