Living organisms contain unique chemical elements which are not found in non-living systems

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 should be the strand of complementary dna produced by the strand of dna shown below cgt ata

The function of the ciliary escalator is to