Some farmers in the Midwest rotate their crops from year to year, switching from soybeans to corn on the same fields. What is one of the advantages of doing this?
A) Soybeans add large amounts of carbon dioxide to the soil, which helps the corn crop.
B) Both crops require the same fertilizing supplies, so farmers save by buying fertilizer in bulk.
C) Corn adds large amounts of phosphorus to the soil, which helps the soybean crop.
D) The corn crop benefits from reactive nitrogen fixed and added to the soil by the soybean crop.
D
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Complete the following nuclear equation: Tl ? Pb +?
A) e B) He C) gamma ray D) both A and B E) none of the above
The outermost gases of early Earth were initially destroyed by radiation from the sun, but the
underlying atmosphere remained intact. Indicate whether the statement is true or false.
The first trophic level in a hydrothermal vent community is ________.
A. dependent on organic material drifting down from the surface B. made up of clams and tube worms C. seriously polluted D. dependent on bacteria and their ability to use hydrogen sulfide E. provided by larvae drifting in deep-sea currents
An ecosystem is an example of a(n) _______________ system since energy and matter are freely exchanged at its boundaries
Fill in the blank(s) with correct word