Front

Concept illustrated in the flowchart

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natural selection

Front

Possible conclusion regarding ancestral horses A and B based on the family tree of the modern horse and knowledge of biology.

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A was better adapted to changes that occurred during the Pliocene Epoch than was B.

Front

Inference about the evolution of modern horses based on Miohippus (browser) and Merychippus (grazer).

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Pliohippus had teeth adapted for grazing

Front

The bones in the forelimbs of three mammals are shown below. For these mammals, the number, position, and shape of the bones most likely indicates that they may have

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developed from the same earlier species

Front

Which era is known as the 'Age of Reptiles'?

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Mesozoic

Front

Which process is correctly matched with its explanation?
Options:
extinction - adaptive characteristics of a species are not adequate
natural selection - the most complex organisms survive
gene recombination - genes are copied as a part of mitosis
mutation - overproduction of offspring takes place within a certain population

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extinction - adaptive characteristics of a species are not adequate

Front

1859: Darwin publishes 'On the Origin of Species by Natural Selection'. This information is most closely associated with:

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an attempt to explain the structural similarities observed among diverse living organisms

Front

The Florida panther, a member of the cat family, has a population of fewer than 100 individuals and has limited genetic variation. What is a valid inference based on this information?

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Over time, these animals will become less likely to survive in a changing environment.

Front

Areas with many different niches will most likely have

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great diversity among the organisms

Front

Scientists in the United States, Europe, and Africa have now suggested that the hippopotamus is a relative of the whale. Earlier studies placed the hippo as a close relative of wild pigs, but recent studies have discovered stronger evidence for the connection to whales. This information suggests that

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scientific explanations are tentative and subject to change