In any practical sense, they don't. Scientists have long ago stopped looking for "proof of evolution", since virtually every observation in Biology turned out to be "proof of evolution". So today, even though every new observation and every new experiment still poses a potential test for evolution, the central theses of evolutionary theory are taken as a given.
The ways that observations in biochemistry, especially concerning DNA and RNA, are consistent with common descent and descent with modification are diverse. For one thing, the molecular make-up of RNA and DNA sequences in life forms seemlessly follow the nested hierarchies of life that we find mirrored in morphology, behaviour and fossils. These sequences allow us to formulate more accurate phylogenetic hypotheses. Also, the biochemical details of DNA and RNA and their ancillary mechanisms show us how evolution works at the molecular level.
Proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.
DNA
All living things have DNA -- both coding and non-coding DNA. The percentage of similarity between living things matches up with the preexisting theory of evolution.
the use DNA evidence. So they check the dna's of organisms and compare them to others and see whos closely related to who..
There is strong evolutionary evidence by people such as Darwin.There is evidence in our biological structures ie: bones and DNA in particular.Although evolution (the theory) is debated there is very strong evidence (look at Darwins books and research)
DNA molecules contain the assembly instructions for every living creature. Scientists compare DNA from ancient and present creatures to identify genetic similarities among species. The genetic similarities among species is the main evidence of evolution theory.
Proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.
DNA
DNA
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.
DNA.
Scientists use a variety of evidence to study prehistoric times, including fossils, geologic strata, archaeological artifacts, DNA analysis, climate data, and isotopic analysis of elements found in ancient specimens. By examining these different types of evidence, scientists can reconstruct past environments, track the evolution of species, and understand human history.
All species have the same genetic code.
The two types are Dna, and fossils
All living things have DNA -- both coding and non-coding DNA. The percentage of similarity between living things matches up with the preexisting theory of evolution.
The two types are Dna, and fossils
The two types are Dna, and fossils