Commercial fertilizers often add _______________ to the soil.
A) carbon and nitrogen
B) carbon and phosphorus
C) nitrogen and phosphorus
D) nitrogen and water
Correct Answer:
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Q15: Approximately _ percent of the Earth's water
Q16: Coral reefs consist of _ polyps, which
Q17: The largest reservoir of carbon is
A) living
Q18: Carbon primarily cycles between
A) animals and plants.
B)
Q19: The bleaching of a coral reef may
Q21: Which form(s) of nitrogen is(are) unusable by
Q22: A _ is a region where all
Q23: Heat from the sun allows water to
Q24: Polar bears are classified as a threatened
Q25: The greenhouse gas that has the longest
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