In paragraph 4, the reading states And when more than 40 percent ...

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In paragraph 4, the reading states And when more than 40 percent of an ecosystem's species disappear
  whether plant, animal, insect, fungi or microbethe effects can be as significant as those caused by a major
  drought. Which of the following best restates this quotation's meaning?
 
  a. Loss of biodiversity is a major crisis comparable to the damage caused by extended periods without rainfall.
  b. Loss of species in an ecosystem affects rainfall.
  c. Overall, a major drought is a more severe problem than the disappearance of an ecosystem's species.
  d. The disappearance of plant and animal species from an ecosystem has more of an impact than the disappearance
  of insect, fungi, or microbes.

Question 2

A little less I'm Lovin' It' could put a significant dent in the problem of childhood obesity, suggests a new
  study in the U.S. that attempts to measure the effect of TV fast-food ads.
  An antonym for obesity is
 
  a. rotund
  b. shapely
  c. fat
  d. extreme thinness

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Answer to Question 1

a. Loss of biodiversity is a major crisis comparable to the damage caused by extended periods without rainfall.

Answer to Question 2

d. extreme thinness