The projected human population of the Earth by 2050 is _____ billion.
A) 5
B) 9
C) 16
D) 21
E) 31
Correct Answer:
Verified
Q28: Secondary growth refers to growth:
A)that is of
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,
Q34: What organisms are found at the base
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
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