Because birds live in every climate and biome, and because they are easy to track and count, they serve as excellent ____.
A. keystone species
B. scapegoats
C. indicator species
D. aesthetic indicators
E. habitat harbingers
Answer: C
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An increase in the amount of carbon dioxide in the atmosphere of a planet will cause the temperature of the planet to get colder.
Answer the following statement true (T) or false (F)
What characteristic feature of Pennsylvanian rocks distinguishes rocks of the Absaroka sequence from those of the Kaskaskia sequence, as well as others in North America?
A)cyclothems B)carbonates C)coal D)conodonts E)chordates
Which of the following has the lowest albedo?
A) Snow that is polluted and several days old B) Forests C) Dry, light sandy soils D) The Moon E) Pack ice off the coast of Antarctica
What causes convection in the mantle?
a. volcanic eruptions b. divergence of continental crust c. heat d. meteor impacts