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Evidence of common descent of living organisms has been discovered by scientists researching in a variety of disciplines over many decades, demonstrating the common descent of all life on Earth developing from a last universal common ancestor.

Replication of Known Dental Characteristics in Porcine Skin: Emerging Technologies for the Imaging Specialist by L.

Stafford, Joseph Thulin, Thomas Wirtz, George Corliss, Kwang Woo Ahn, Alexis Visotky, Ronald L.

Fossils are important for estimating when various lineages developed in geologic time.

As fossilization is an uncommon occurrence, usually requiring hard body parts and death near a site where sediments are being deposited, the fossil record only provides sparse and intermittent information about the evolution of life.

Additional genetic information conclusively supports the relatedness of life and has allowed scientists (since the discovery of DNA) to develop phylogenetic trees: a construction of organisms evolutionary relatedness.

It has also led to the development of molecular clock techniques to date taxon divergence times and to calibrate these with the fossil record.

Modern science accepts that the Earth is about 4.54 billion years old and the entire universe is around 13.77 billion years old.

These limits usually take the form: "Because we observe [X], which occurs at rate [Y], the universe must be at least [Z] years old".

Chemists follow the method a bit differently than psychologists.

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