Ten thousand years ago,when human populations began growing in number,the main reason was:
A) access to better medicine
B) a warming climate
C) extinction of large predators
D) the advent of agriculture
Correct Answer:
Verified
Q4: Which city is considered a brown-air city
Q5: Our environmental problems can be solved by:
A)proper
Q6: How many species of animals and plants
Q7: The Clean Air Act of 1990 was
Q8: Acid precipitation is so deadly because it:
A)changes
Q10: Brown-air cities are so-called because:
A)of excessive acid
Q11: Agricultural chemicals,such as DDT,are so damaging to
Q12: Groundwater came to be in the ground
Q13: Air and water pollution result mainly from:
A)increased
Q14: To be a viable alternative,nuclear power facilities
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