Scientists have never seen the ancient horses shown in figure 16-4 what do you think was the main type of evidence scientists used to prepare these diagrams

It is likely that scientists used fossil evidence to prepare these diagrams. Even if a complete fossil of a particular species is never found, a critical mass of fossil evidence can reveal a lot of information. Even a single key leg bone can provide a good idea of the physiological form and size of that individual animal. Continual fossil discoveries and debate amongst paleontologists will begin to develop a consensus of what the species likely looked like.

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b. the carbon cycle ensures living things have a source of hydrogen