What does a fossil tell us about how life evolved.?

Question

What does a fossil tell us about how life evolved.?

Answer 1

There  have layers of rocks that show development over time.

As time passes certain animals gained or lost features such as wings.

Answer 2

One alone doesn't.  What you have to do is to compare it to other fossils, and build up a picture that way for different stretches of time.  A single fossil is but one link in an imperfectly known chain of extinct organisms.

Answer 3

Fossil evidence of a series of fossils can show mutations that equipped organisms with characteristics that made them better able to survive in their environment.

Hundreds of thousands of fossil organisms, found in well-dated rock sequences, represent successions of forms through time and manifest many evolutionary transitions.

Microbial life of the simplest type was already in existence 3.5 billion years ago. The oldest evidence of more complex organisms such as eukaryote cells have been discovered in fossils sealed in rocks approximately 2 billion years old.

Multicellular organisms, which are the familiar fungi, plants, and animals, have been found only in younger geological strata.