I think it's Genetic engineering
The answer would be transitional forms like Archaeopteryx make
available DNA confirmation that demonstrates how organisms are related. Transitional
fossils establish the middle forms that happened over the evolutionary
trail taken by a single genus. A case in point of a transitional fossil is
archaeopteryx, which relates the evolution of dinosaurs (from jaws and claws)
to birds (feathers).
Colours ....cones gives information about colours !