Zooplankton are always ________.

A. animals
B. heterotrophs
C. multicellular
D. All of these are correct.
E. None of these is correct.


Answer: B

Environmental & Atmospheric Sciences

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Until about 10,000 years ago, our species depended on ________

A) hunting and herding B) cattle and goats C) hunting and gathering D) crops and cattle E) crops

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Current worldwide food production is less than in previous decades.

Answer the following statement true (T) or false (F)

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Forest fires are not a major threat to forest ecosystems as part of a natural cycle.

Answer the following statement true (T) or false (F)

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Soil structure can be defined as which of the following?

A) blocky B) platy C) crumb or granular D) prismatic E) Crumb or granular, platy, blocky, or prismatic are all type of soil structure.

Environmental & Atmospheric Sciences