predict: one ecosystem that has been studied a great deal in recent years is a coral reef, an undersea ecosystem rich in marine animals living in or around tropical corals. name one abiotic and one biotic factor present in coral reefs (hint: look at the picture above)

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.

he would use the colour black

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