When marine organisms are present in a rock, it indicates that:

marine organisms moved to land.

the rock is very old.

the rock has moved.

the rock was once in a marine environment.

D. The rock was once in a marine environment.

Explanation:

The question says when MARINE organisms are present in a rock, meaning it was in a marine environment. Most fossils are found on land, but scientists can easily figure out of it was originally from land or marine based.  

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the answer to this question is the third option. hope this