GRE课程
Tropical forests typically have many more species of plants and animals than do temperate forests of comparable size. During the Ice Age, forests in temperate regions were destroyed, while those in the tropics were not. Accordingly, one proposed explanation of this difference in the number of species is that tropical forests typically had a much longer period than temperate forests in which different species could take hold.
Which of the following, if true, most strongly supports the proposed explanation?
The greater warmth of tropical forests enables them to sustain a greater density of plants and animals than temperate forests can.
There is virtually no overlap between the species that are found in tropical forests and those found in temperate forests.
Some areas that were temperate forests before the Ice Age are no longer forested.
The number of plants and animal species is no greater in tropical forests that have arisen since the Ice Age than in temperate forests of comparable size.
A change in climate tends to increase the rate at which new species become established in a region.
Select one answer choice.
