The amount of energy captured by plants and made available to consumers in an ecosystem is called
A) secondary trophic level.
B) nutrient cycling.
C) net primary productivity.
D) energy pyramid.
E) biological magnification.
C
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The diversity of movement found in eukaryotic cells is propagated by the:
A. nucleus. B. mitochondria. C. cytoskeleton. D. plasma membrane.
Mitochondria and chloroplasts in eukaryotic cells probably originated from:a
fungi. b. protists. c. endosymbionts. d. plants. e. animals.
Which statement about human reproduction is correct?
A) Fertilization occurs in the uterus. B) In humans, spermatogenesis and oogenesis function best at normal, core body temperatures. C) A human oocyte completes meiosis after a sperm penetrates it. D) The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
After a copper smelter begins operation, local downwind populations of plants begin to adapt to the resulting air pollution. Scientists document, for example, that the acid tolerance of several plant species has increased significantly in the polluted
area. This is an example of A) stabilizing selection. B) disruptive selection. C) directional selection. D) genetic drift.