Which group of organisms is most responsible for changing earths early atmosphere?

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.