Endothermic animals
a. use up more energy than ectotherms.
b. have more stamina than ectotherms.
c. have a higher metabolic rate than ectotherms.
d. may have layers of fat to reduce heat loss.
e. fit all of these descriptions.
Answer: e
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a. acetylcholine b. ATP c. calcium d. actin e. myosin
All populations of all species in a habitat are a __________. Fill in the blank(s) with the appropriate word(s)
The inner layer of a blood vessel is the endothelium.
a. true b. false
Action potential begins when which of the following occurs?
A) The inside of the neuron becomes more negative relative to the outside. B) Sodium channels open sequentially. C) The membrane becomes depolarized. D) Potassium ions diffuse to allow repolarization of the cell.