Water covers about ______ percent of the Earth's surface.
A. 33
B. 40
C. 50
D. 70
E. 80
Answer: D. 70
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Which environment would be most likely to harbor a biodiversity hotspot?
a. tropical island b. temperate grassland c. temperate deciduous forest d. desert e. savanna
In negative feedback, the variable being regulated is changed in the ________ direction, while in positive feedback the variable is changed in the ________ direction.
A. inhibitory; stimulatory B. decreasing; increasing C. same; opposite D. opposite; same E. negative; positive
Which of the following are compounds?
A) H2O, O2, and CH4 B) H2O and O2 C) O2 and CH4 D) H2O and CH4, but not O2
Which factor is the most important algal contribution to the fungal component of a lichen?
A. Improved water conservation B. Mechanical protection C. Photosynthetically derived food D. Conversion of nitrogen gas to nitrates E. Pigment for camouflage