How does the evolution of opsin provide specific?

Paleontology, evolutionary biology, molecular cell biology, biochemistry, geology, genetics, biogeography, evolutionary development and so on and so on. The evidence is there in massive amounts....

Paleontology, genetics, molecular biology, taxonomy, evolutionary development and comparative anatomy, just to name a few.

Fossils, patterns of early development, similar body structures, DNA, and protein structures.

It is the net resistance offered by the body of unit length and unit cross section area at a given temperature to the flow of electrons.It is the constant for a material dependent on temperature.It...

Embryology: In the first few days of development, a human embryo looks very similar to that of any other animal. After a few weeks, we can tell it's a vertebrate animal, but it doesn't yet look human...