The greenhouse effect, which has become a major ecological concern, is caused by
A) the destruction of ozone in the upper atmosphere.
B) the increase in atmospheric concentrations of greenhouse gases (CO2,CH4, and N2O).
C) overuse of fertilizers in farming.
D) global warming.
E) the release of heat energy from burning fossil fuels.
B
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Cnidarians are
A. aquatic animals. B. Both land-dwelling animals and aquatic animals are correct. C. land-dwelling animals. D. arboreal animals. E. Both land-dwelling animals and arboreal animals are correct.
At high population density, __________ is favored,
investing more time and energy in fewer, higher quality offspring. Fill in the blank(s) with the appropriate word(s).
What are the three major types of RNA and their functions? What would happen to translation if each type of RNA were degraded?
What will be an ideal response?
What do synaptic signaling and paracrine signaling have in common?
A. Cells release a signal that affects cells at long distances. B. Cells release a signal through gap junctions to affect neighboring cells. C. Cells release a signal that affects neighboring cells. D. Cells bind a membrane bound signal on a neighboring cell. E. Cells release a signal that affects it and neighboring cells.