Stretched out, an adult's gastrointestinal tract would be
a. 10?15 feet.
b. 15?20 feet.
c. 21?30 feet.
d. 30?35 feet.
e. 5?10 feet.
C
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Among vertebrate animals, urea is _____
A) made in the kidneys and immediately excreted B) added to the air in the lungs to be exhaled, along with carbon dioxide C) made in the liver by combining two ammonia molecules with one carbon dioxide D) made in the pancreas and added to the intestinal contents, along with bile salts, for excretion E) rarely the nitrogenous waste
If individuals move from one population to another, it may cause a shift in allele frequencies due to
a. genetic drift. b. directional selection. c. natural selection. d. mutation. e. gene flow.
As the magnification of a series of objective lenses increases, the working distance
A. decreases. B. stays the same. C. increases. D. cannot be predicted.
What is the impulse that travels down a neuron's axon?
A) shock signal B) action potential C) currenter D) resistor