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.

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

Earth's climate cycles between warmer and colder periods

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences