Vertebrate locomotion results from the contraction of muscles anchored to what other tissue?
A. bone
B. an exoskeleton
C. nerves
D. the plasma membrane
E. each other
Answer: A
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Cells undergo exocytosis ____
a. to pump protons down a concentration gradient b. when replicating c. to secrete protein and wastes from the cell d. to ingest nutrients e. as a means of cellular protection
A drop in blood volume will trigger the body to
secrete a. parathyroid hormones. b. somatotropin. c. antidiuretic hormone. d. insulin. e. glucocorticoids.
The primary reason that Earth experiences seasons is because of the:a
Earth's rotation. b. Earth's orbit. c. Earth's tilt on its axis. d. unequal thickness of the Earth's atmosphere. e. different layers of the Earth's atmosphere.
The proposition that the mitochondria in our cells descended from engulfed bacteria is called the ________ theory
Fill in the blank(s) with correct word