PrepTest 87, Section 3, Question 10
Giant ground sloths began disappearing from the Americas about 10,000 years ago, around the time that the last ice age ended, and are now extinct worldwide. Scientists had thought that these sloths failed to adapt to climate changes, but they are now coming to believe that it was the arrival of human beings shortly before that ice age ended that was responsible for the sloths' disappearance.
Giant ground sloths began disappearing from the Americas about 10,000 years ago, around the time that the last ice age ended, and are now extinct worldwide. Scientists had thought that these sloths failed to adapt to climate changes, but they are now coming to believe that it was the arrival of human beings shortly before that ice age ended that was responsible for the sloths' disappearance.
Giant ground sloths began disappearing from the Americas about 10,000 years ago, around the time that the last ice age ended, and are now extinct worldwide. Scientists had thought that these sloths failed to adapt to climate changes, but they are now coming to believe that it was the arrival of human beings shortly before that ice age ended that was responsible for the sloths' disappearance.
Giant ground sloths began disappearing from the Americas about 10,000 years ago, around the time that the last ice age ended, and are now extinct worldwide. Scientists had thought that these sloths failed to adapt to climate changes, but they are now coming to believe that it was the arrival of human beings shortly before that ice age ended that was responsible for the sloths' disappearance.
Which one of the following, if true, provides the most support for the scientists' new belief?
Scientists have not found any physical evidence to support the idea that giant ground sloths were hunted to extinction.
Species of smaller tree-dwelling sloths continue to live throughout South and Central America.
Their large size made the giant ground sloths less adaptable than most other ground mammals.
Giant ground sloths are not the only large mammals that began to disappear from the Americas around 10,000 years ago.
One type of giant ground sloth survived on isolated islands until human beings arrived there well after the last ice age.
Explanations
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