Gymnosperms, angiosperms, and ferns are alike in that they all
A. produce seeds.
B. have well-developed vascular tissue.
C. have flowers during some part of their life cycles.
D. lack a gametophyte generation.
B. have well-developed vascular tissue.
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Excess glucose is converted into glycogen in the
a. pancreas. b. liver. c. thymus. d. thyroid. e. kidneys.
An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population
If broadness of stripes is genetically determined, what effect has the ground-squirrel population experienced during the earthquake? A) directional selection B) disruptive selection C) a founder event D) a genetic bottleneck
Diversification of mammals after the extinction of the dinosaurs is considered an adaptive radiation because a few mammal species rapidly evolved into most of the current mammalian lineages in a relatively short amount of time. This diversification was partially driven by the evolution of endothermic homeostasis in mammals, which is an example of
A. a key innovation. B. reproductive isolation. C. allopatric speciation. D. hybridization.
Consider an animal that exchanges gases through its skin. Which of the following body shapes would provide the most surface area for gas exchange?
A) a flat rectangle with sides measuring 3 inches and 4 inches B) a flat square with sides measuring 2 inches each C) a flat rectangle with sides measuring 2 inches and 9 inches D) a flat square with sides measuring 4 inches each