If environmental circumstances change, they are now less adaptable, not more. Evolution, on the other hand, requires a gain in information to produce new species. Otherwise amoebas remain amoebas, fish remain fish, and bats came from other bats. It is assumed that over countless generations, mistakes occur in the genetic code, producing new characteristics, and that, given enough time and mistakes, a new species results. Every living thing, from the most simple virus to the most complex animal, contains in its cells very complex compounds called nucleic acid.
Viruses contain only one or the other, but cells contain both.
While RNA controls protein production, DNA is the main component in chromosomes, which provide the blueprint or pattern of heredity. Every time a cell divides into two, the RNA in the cell body and the DNA in the nucleus must be exactly copied, with one copy going with each cell. DNA is an incredibly complex molecule, resembling a long ladder that has been twisted into a spiral. RNA has a similar structure, but the sugar is different, and one of the four bases is also different. Each bat has to recognize the echo of its own call in the middle of millions of other echoes to avoid collisions and find its way.