The wings of bats and birds and the flippers of porpoises are
a. analogous structures.
b. totally unrelated.
c. functionally different.
d. homologous structures.
e. similar by chance.
D
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Which one of the following explains what xylem loading is?
A. when the xylem is filled with sugars B. right after the xylem is filled with minerals C. when the xylem is filled with water D. xylem loading never occurs E. phloem has given up its water to the xylem
Boyle's law of gas behavior predicts that as the volume of the lungs _____, the pressure of gases within the lungs must ______.
A. increase, decrease B. increase, increase C. decrease, decrease D. increase, not change E. decrease, not change
What makes a prion unique as an infectious particle?
What will be an ideal response?
Chronic stress:a
is associated with elevated levels of glucocorticoids. b. may lead to the excessive stimulation of neurons. c. increases blood flow to the brain, especially the hippocampus. d. results in lower levels of epinephrine and norepinephrine. e. promotes the linear growth of the skeleton