Compare and contrast respiration In insect and fish?​

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

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