All of the living and nonliving things that interact in a particular area make up a

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 controls activities within a eukaryotic cell?

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.