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Question
Scientists are studying the evolutionary history of two closely related mammal species. They identify the earliest known evidence of each species and the most recent bones of the presumed common ancestor. The data is recorded in the chart.
Common Ancestor Bones Species 1 Bones Species 2 Bones Location Asia and North America North America Asia Age (years) 15,000 5,000 6,000
Based on the data, which of the following is a reasonable estimate of when populations of the common ancestor became reproductively isolated?
Scientists are studying the evolutionary history of two closely related mammal species. They identify the earliest known evidence of each species and the most recent bones of the presumed common ancestor. The data is recorded in the chart.
| Common Ancestor Bones | Species 1 Bones | Species 2 Bones | |
| Location | Asia and North America | North America | Asia |
| Age (years) | 15,000 | 5,000 | 6,000 |
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Solution
The correct option is A 1,000 years ago
The two species became reproductively isolated about 1,000 years ago as the time interval between the age of the two species is 1,000 yearsSo, the correct answer is '1,000 years ago'
The two species became reproductively isolated about 1,000 years ago as the time interval between the age of the two species is 1,000 years
So, the correct answer is '1,000 years ago'
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