What organisms are found at the base of productivity in almost all ecosystems?
A) photosynthetic bacteria and algae only
B) animals only
C) plants and algae only
D) photosynthetic bacteria, algae, and plants only
E) photosynthetic bacteria, algae, plants, and animals
Correct Answer:
Verified
Q29: Phytoremediation refers to the process by which
Q30: In all ecosystems, heterotrophs are completely dependent
Q31: Humans first appeared about _ years ago.
A)2000
B)200,000
C)2
Q32: A seed is composed of three parts:
A)root,
Q33: The projected human population of the Earth
Q35: The development of agriculture started at least
Q36: Cytology is the study of:
A)energy transformations.
B)plant form.
C)heredity.
D)fossil
Q37: Natural communities of organisms of wide extent,
Q38: Proteinoid microspheres provide evidence that organic molecules
Q39: The greenhouse effect refers to the:
A)depletion of
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