Is any form of adaptation coevolution?
a. Yes, evolution always happens in response to environmental change.
b. Yes, other species are always part of an organism's environment.
c. No, only evolution as an action–reaction response to a selection pressure imposed by interact-ing organisms on each other qualifies as coevolution.
d. No, coevolution is by definition limited to mutualistic interactions.
C
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What causes the AV (atrioventricular) valves within the heart to open during the cardiac cycle?
a. pressure generated by ventricular muscle contraction b. an action potential c. fluid pressure from the atria filling with blood d. a pacemaker signal e. arterial blood pressure
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a. 10%. b. 25% c. 50% d. 90% e. 99%
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A. some B. all C. none D. 5-10% of the motor units E. 10-15% of the motor units