Fossil records are not complete. By some estimates, less than 1% of organisms that have lived appear in the fossil record.
You cannot. You can only add data to records that you have. If you do not have complete data then you will have incomplete records.
incomplete, undone, unfinished, unperfected
incomplete
is datura complete or incomplete flower
Fossil records are incomplete because there are many random, destructive processes which can harm or destroy fossils. Think of all the violence of nature, earthquakes, floods, forest fires, landslides, volcanoes, etc. And fossils are not necessarily that durable. Many things can damage them. Some scavenger could chew on them. A large animal could step on them. It doesn't necessarily take an earthquake to damage a fossil. Fossils are just lying around, they are not protected or conserved, unless some paleontologist digs them up and puts them in a museum.
incomplete
Incomplete Metamorphosis
incomplete
Incomplete
marigold is an incomplete flower.
complete metamorphosis
incomplete