A coral is a type of ________ that secretes ________ to form an organic rock home
A) algae; silica
B) polyp; silica
C) algae; calcium carbonate
D) polyp; calcium carbonate
E) algae; carbon dioxide
D
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Gravitational attraction by Earth on a gliding bird pulls it downward. The reaction to this downward force is
A. the bird pulling Earth upward. B. the bird's attraction to Earth. C. air resistance by the bird on the air. D. all of the above E. none of the above
The earth can support our current population and resource use indefinitely.
Answer the following statement true (T) or false (F)
Although traditional agriculture is common in many parts of the world, the United States primarily uses ____________________ agriculture for food production.
Fill in the blank(s) with the appropriate word(s).
How do greenhouse gases warm Earth’s atmosphere?
What will be an ideal response?