Earth's orbit varies from nearly a circle to an ellipse and back again in about:a
1,000,000 years.
b. 100,000 years.
c. 10,000 years.
d. 1,000 years.
e. 100 years.
B
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Pesticide use has tripled in the past 40 years, yet pests still cause extensive damage to crops. Why has this increased use of pesticides not been more effective?
A) Increases in ultraviolet radiation and global warming break down pesticides faster. B) The widespread use of pesticides has resulted in the evolution of pesticide-resistant pests. C) The pesticides in use today are much less powerful due to government regulations. D) The pesticides available are no longer suited for the most common types of pests.
Reducing population growth rates in poor countries can be accomplished by ________
A) reproducing beyond replacement fertility B) economic disasters C) valuing the birth of a son D) education of women E) illness in infants
Where does the deep-ocean basin begin along a passive continental margin?
A) Abyssal plain B) Continental rise C) Continental shelf D) Continental slope E) Shoreline
Briefly describe what is meant by the term pioneer species. Identify the general characteristics of pioneer species, and give an examples of pioneer species
What will be an ideal response?