AP BIOLOGY

Detailed explanation-1: -The collection of fossils and their placement in chronological order (e.g., through the location of the sedimentary layers in which they are found or through radioactive dating) is known as the fossil record.

Detailed explanation-2: -The fossil record is made up of all the fossils ever discovered on Earth. It has millions of fossils that come from many thousands of species. Most of these species are no longer alive on Earth. The fossil record provides evidence that species have changed over time.

Detailed explanation-3: -A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order. Fossils are created when organisms die, are incased in dirt and rock, and are slowly replaced by minerals over time. What is left is a mineral impression of an animal which once existed.

Detailed explanation-4: -The fossil record helps paleontologists, archaeologists, and geologists place important events and species in the appropriate geologic era. It is based on the Law of Superposition which states that in undisturbed rock sequences the bottom layers are older than the top layers.