Need and answer :)
How much does the Earth weigh?

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

18. which statement about cancer is true?

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.