A scout troop sets out on a backpacking trip. Soon, an unexpected storm gets them drenched, and the troop leaders discover that few boys have packed warm clothes. Several scouts start shivering uncontrollably, a sign of hypothermia. The leaders call off the trip and the group heads back to their cars. This shivering response was
A. a maladaptive response that wastes energy.
B. a social signal that evolved to alert adults to take action.
C. an attempt to produce heat by creating friction with their clothing.
D. an attempt to produce heat by burning large amounts of ATP.
Answer: D
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A) Methanopyrus B) Thermoproteus C) Thermosphaera D) Pyrococcus
Comparing the body structures of organisms to find evidence of a shared evolutionary history is called ________.
A. analogous reconstruction B. comparative anatomy C. physiology D. outgrouping
Modern humans have lost the system of air sacs that other great apes have. Whatever the reason for this loss, one resulting effect on human behavior was ________
A) restriction of modern humans to low altitudes B) loss of the ability to make loud calls C) improved ability to swallow D) increase in the sizes of Broca's and Wernecke's areas E) the ability to pronounce sounds more clearly
Black-bellied seedcrackers have either small beaks (better for eating soft seeds) or large beaks (better for hard seeds). There are no seeds of intermediate hardness; therefore, which kind of selection acts on beak size in seedcrackers?
A. Stabilizing selection B. Directional selection C. Disruptive selection