Discuss ecological methods used to determine distribution in two paragraphs. * Someone help me with this please

What causes darkening of the skin as melanin production increases

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

What enzyme is most important for dna replication and why?