The most powerful biotic agent on Earth, influencing all ecosystems on a planetary scale is
A) autotrophs.
B) tertiary consumers.
C) detritivores.
D) humans.
E) the sun.
D) humans.
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Which of the following is not true of basaltic lava flows?
A) They flow downhill from the vent area. B) They pile up in steep, cone-shaped hills. C) They form from nonexplosive eruptions. D) They can issue from the bases of cinder cones.
Air and water pollution are directly responsible for the loss of some species
In their studies of these pollution effects, biologists have determined that ________ are especially sensitive to air pollution, and are now being used as an index of urban air quality. A) songbirds B) evergreen trees C) deciduous trees D) lichens E) warblers
Earth's climate cycles between warmer and colder periods
Indicate whether the statement is true or false
If a substance with a vapor density of 2.3 is released into the environment, it will _____.
a. Rise and dissipate b. Float on water c. Evaporate d. Collect in low spots