Why are fossilized organisms so different from the animals on Earth today?

Fossils provide evidence about life on Earth that currently extinct. Through fossils, we've discovered several species of animals and plants that previously existed. We also learn how life on Earth changed throughout the years. Fossils found in younger rocks look like animals and plants that are living today. Fossils in older rocks look less like the current living animals and plants. Some fossils found look either more or less like current species we know today.

Explanation:

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.