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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explanation:

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the energy generated by an individual's metabolism is calculated in met (metabolic equivalent of task). the met is the ratio of the work metabolic rate to the resting metabolic rate. one met is illustrated as 1 kcal per kilogram per hour, and is probably equal to the energy cost of sitting quietly.

1 met is equal to 1.162 watt per kg

1 kg is equal to 1000 grams

as the person weighs 80000 gm, that is, 80 kg.

therefore, 80*1.162 = 92.96

thus, the person expends 92.96 watts of power while at rest.