It has been proposed that mitochondria and chloroplast are modern descendants of early prokaryotic cells that began to reside and gradually evolve in with primitive cells

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

According to this food web which of the following would be considered primary consumers

If a checkpoint detects damaged dna, the checkpoint may