Question

what is the most important conclusion scientists can draw from studying fossils? that environments on earth can change over time. that antarctica has always been a cold continent. that all deserts were once covered by water. that sharks have not changed for millions of years.

Explanation:

Fossils can show how Earth's environments have changed over geological time. For example, finding fossils of marine - life in areas that are now deserts or mountains indicates environmental change. Antarctica was not always cold, and not all deserts were once covered by water, and the statement about sharks is too simplistic.

Answer:

That environments on Earth can change over time.