Evidence supporting the Theory of Evolution through Natural Selection comes in various forms. [?] provide several levels of evidence:
They occur at different depths within rock, and show that millions of years ago there were many that are not present today. This means many species have become [?]. This is consistent with Darwin's theory that evolution relies on extinction (of the less ).
They also show that these older species tended to be much [?], but that gradually over time, they became more as they accumulated 'better and better' [?] improving the gene [?].

More recent evidence came from studies of the [?] moth. This showed that if the selection pressures change, this forces the species to in order to survive. Peppered Moths (Biston betularia) are nomally very so that can lay on the whitish [?] encrusted bark of trees during the day, camouflaged from predatory [?].
Unfortunately, during the [?] revolution there was so much smoke gushing out of chimneys, that in urban areas the soot covered the lichen, turning it . Now, when pale Peppered Moths hid during the day they were really obvious, so the birds had no trouble catching and eating them (and therefore the 'pale' version of the skin colour gene.
Fortunately for the moth, the skin colour gene had a [?] to form a very dark colour (called the mellanic form). This obviously was not as obvious on a dark trunk, so was not eaten by birds, so the melanic was not removed from the gene . These melanic moths therefore survived and to produce more melanic offspring. This demonstrated how the characteristics of a species could change if the selection pressure changed. In this case the selection pressure was based on camouflage.