The K-Pg boundary layer is evidence of
a. a crater.
b. a meteorite impact.
c. a period of planetary cooling.
d. dinosaur life.
e. sedimentary rock.
b
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Which one of the following is not a way in which biology is typically approached?
A. biomechanics B. physiology C. zstrology D. cognition E. behavior
The bulging of a(n) ____ during the
contraction of the ventricles is referred to as ____.
a. arteriole; pulse b. artery; blood pressure c. arteriole; blood pressure d. artery; pulse e. vein; pulse
Each species occupies a certain __________, characterized by physical and chemical features and by the array of other
species living in it. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about action potentials on very long nerve cells is true?
A. are liable to fade if the neuron is not repeatedly stimulated B. are transmitted the entire length of the nerve undiminished C. are propagated at various speeds depending on the strength of the original action potential D. can recur immediately if the cell receives continuous stimulation. E. utilize nearby glial cells to boost the speed of transmission.