The "fight-flight" response is enhanced by secretions
a. from the adrenal cortex.
b. known as epinephrine and norepinephrine.
c. stored in the pancreas.
d. from the kidneys.
e. known as acetylcholine.
B
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Scientists have proposed a number of mechanisms by which the xylem carries water to the tops of the highest trees. Which of the proposed mechanisms is the correct one?
a. capillary action b. guttation c. transpiration d. root pressure e. xylem pumps
Ctenophores exhibit:a
bilateral symmetry. b. spherical symmetry. c. linear symmetry. d. radial symmetry. e. circular symmetry.
As used in twin studies in mammals, distinguish between the terms concordant and discordant
What will be an ideal response?
Which of these cell types can be described as muscle cells that contract rapidly, are rich in glycogen deposits, and depend on anaerobic respiration to produce ATP?
A) slow-twitch cells B) fast-twitch cells C) myoglobin D) hemoglobin