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.

Biology & Microbiology

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Excess glucose is converted into glycogen in the

a. pancreas. b. liver. c. thymus. d. thyroid. e. kidneys.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology