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I have a question about a practice test!! Why is the correct answer B? I chose A. I don't know the difference between B and A.

Impacts by meteorites represent one mechanism that could cause global catastrophes and seriously influence the evolution of life all over the planet. According to some estimates, the majority of all extinctions of species may be due to such impacts. Such a perspective fundamentally changes our view of biological evolution. The standard criterion for the survival of a species is its success in competing with other species and adapting to slowly changing environments. Yet an equally important criterion is the ability of a species to survive random global ecological catastrophes due to impacts.
 
Paragraph 6 supports which of the following statements about the factors that are essential for the survival of a species?
 
A. The most important factor for the survival of a species is its ability to compete and adapt to gradual changes in its environment.
 
B. The ability of a species to compete and adapt to a gradually changing environment is not the only ability that is essential for      survival.  
 
C. Since most extinctions of species are due to major meteorite impacts, the ability to survive such impacts is the most important      factor for the survival of a species.
 
D. The factors that are most important for the survival of a species vary significantly from one species to another.
 
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1 Answer

Answer A is stating that there is only one important factor for the survival of a species - adaptation. But if you reread the paragraph, especially the last sentence, it is saying there is yet another equally important factor - to survive random catastrophes. So therefore answer B is correct because there is more than just the one accepted criteria that is important to the survival of a species.

Comments

Thank you, Jeremy!!
You are right, I was confused the last sentence. But, the most important factor is " adaptation", so B is correct.
I have to focus on the main idea.
Thank you again!!

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