Biologist: Species with broad geographic ranges probably

[BTGmoderatorDC]

Biologist: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges. The broader a species' range, the more likely that species is to survive the extinction of populations in a few areas. Therefore, it is likely that the proportion of species with broad ranges tends to gradually increase with time.

The biologist's conclusion follows logically from the above if which of the following is assumed?

A. There are now more species with broad geographic ranges than with narrow geographic ranges.
B. Most species can survive extinctions of populations in a few areas as long as the species' geographic range is not very narrow.
C. If a population of a species in a particular area dies out, that species generally does not repopulate that area.
D. If a characteristic tends to help species endure longer, then the proportion of species with that characteristic tends to gradually increase with time.
E. Any characteristic that makes a species tend to endure longer will make it easier for that species to survive the extinction of populations in a few areas.

OA D

Source: Official Guide

[deloitte247]

Premise: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges.
Conclusion: The broader a species' range, the more likely that species is to survive the extinction of populations in a few areas; so, it is likely that the population of species with broad ranges tend to gradually increase with time.

Option A - Incorrect
The passage didn't state the number of species with broad or narrow geographic ranges. So, we cannot know if there are more broad geographic ranges than narrow geographic ranges.

Option B - Incorrect
According to the passage "the broader a species' range, the more likely that species is to survive the extinction of populations in a few areas", while this is true but it doesn't logically support the biologist conclusion which is on the population of species with broad ranges and growth in time.

Option C - Incorrect
The argument is not concerned with the repopulation of species. This is out of context regarding this passage.

Option D - Correct
from the passage, the characteristics of a species with broad ranges enable them to endure longer than species with narrow ranges, and as a result of this, the proportion of species with broad ranges tends to gradually increase with time. This option agrees logically with the biologist's conclusion, hence, it is the correct option.

Option E - Incorrect
Note the word "any" in this option. The main characteristics that make a species to the last longer are broad geographic ranges "-the broader a species' range, the more likely that species is to survive the extinction of populations in a few areas". So, this option is invalid.

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