Monkeys and bats have similar bone structure in their forelimbs. However, monkeys have longer forelimbs to use for climbing and swinging in trees. Bats have shorter forelimbs to use for flight. Which term best describes how monkey and bat forelimbs are related to each other?

the answer is homologous

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.