Evolutionists no longer are concerned with obtaining evidence to support the fact of evolution but rather are concerned with what sorts of knowledge can be obtained from different sources of evidence.
When an organism dies, it is usually destroyed by other forms of life and by weathering processes.
Some are so radically different that paleontologists have created new phyla in order to classify them.
( Cambrian Period.) The first vertebrates, animals with backbones, appeared about 400 million years ago; the first mammals, less than 200 million years ago.
All living creatures are related by descent from common ancestors.
Humans and other mammals descend from shrewlike creatures that lived more than 150 million years ago; mammals, birds, reptiles, amphibians, and fishes share as ancestors aquatic worms that lived 600 million years ago; and all plants and animals derive from bacteria-like microorganisms that originated more than 3 billion years ago.
Hereditary variants were thought to arise naturally in populations, and then these were either selected for or against by the contemporary environmental conditions.