Extended Response

Scientists classify amniotes from 300 million years ago into two major groups: the diapsids and the synapsids. A unique subset of synapsids from 245 million years ago is made up of therapsids. Modern mammals are grouped into the monotremes, the marsupials, and the placental mammals.

Part A Describe modern scientific hypotheses about the evolutionary relationships among these groups of amniotes.

Part B Describe the kinds of evidence that scientists examine to test these hypotheses.

For questions requiring an extended response, make an outline listing the key points of your response before you begin writing.

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