Simularities in DNA sequence
These days its DNA analysis.
It simply highly suggests that all organisms going through this developmental phase have common ancestry, thus are related on the tree of life.
limbs wings legs arms and flippers
Actually, it is the strongest evidence for evolution. Without one fossil we would know from the DNA evidence that evolution has occurred and is occurring. It is in the DNA of organisms that we see the strongest evidence for common ancestry. The products of those genes are sometimes highly conserved down the ages. Ribosomes, the workbenches on which proteins are made, differ hardly at at between you and pets.
That evidence is homologous. Shared common ancestry. In this case you could trace this homology back as far as the common ancestor of gorillas and hominid fossils, or as far back as the emergence of all tetrapods.
Of common ancestry, though ontogeny does not recapitulate phylogeny, ontogeny, development, can create phylogeny.
Such similarities are taken to be evidence of common ancestry.
The strong evidence for the common ancestry of all vertebrates is THE SIMILARITY OF THEIR EMBRYOLOGICAL STAGES.
The DNA genetic code provides the best evidence of the common ancestry of life. Science has shown that there are many similarities between DNA sequences.
It does hint at common ancestry so it is "evidence" of evolution.
Simularities in DNA sequence
That different organisms are able to adapt to the same environment.
It simply highly suggests that all organisms going through this developmental phase have common ancestry, thus are related on the tree of life.
Many of their genes are the same.
If organisms have similar genes, then they are closely related.
DNA (Deoxyribonucleic acid) is the genetic material because it contains the code for the entire organism. It's sort like an equation from which an entire organism with all it's unique differences can be created.
fossil evidence :)
limbs wings legs arms and flippers