The development of agriculture started at least ______ years ago.
A) 1000
B) 10,000
C) 100,000
D) 1 million
E) 10 million
Correct Answer:
Verified
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
Q34: What organisms are found at the base
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
Q40: Evidence exists for the presence of ice
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