When paleontologist study fossils which is true of the fossil record that they find

The paleontologist study fossils after their discovery. They record their age by carbon dating and give information about the evolutionary history about the fossils.

Fossils are the remains of living organisms which are buried in the earth for thousands of millions of years.

Paleontologist study fossils for the prediction of evolutionary ancestors of the current living organism.

But some of the links in phylogenetic tree is missing due to the missing of fossils of some intermediate organism.

If an animal is not completely covered by the sediments, it will decomposed early.