The morphological evidence which is shown in fossils to modern animals supports evolution because some dinosaurs, for instance, had feathers and we can obviously see that trait today in birds. The biochemical evidence, which comes in the form of DNA comparison and amino acid similarities, shows that we related closely to monkeys and pigs, which suggests that we have close ancestors to these animals.
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Physiological similarities suggest the species evolved from the same ancestor.
The basis for all science, be it evolution or the study of how squeaky noises annoy people, is evidence. Darwin's primary evidence for evolution by natural selection was morphological homology; physical similarities between species. Modern evidence for evolution by natural selection is vast and includes a rich fossil record, well understood geologic evidence, radioisotopic evidence, as well as a host of genetic evidence from protein homologies to complex molecular systematics. All evidence for evolution converges on the singular observation that all organisms can be organized in a nested hierarchy much like a family tree; a Tree of Life.
It's mutability and it's heritability. It changes and these changes, in the germ line, are inherited by your progeny, The change in allele frequency over time in a population of organisms; evolution.
I do not ' believe ' in evolution, but I am convinced by the evidence.
"The evidence for evolution countervails over the arguments against it." THis means that evidence for evolution counteracts the arguments against it.