How do an increase in the organic matter in soil and an increase in soil depth affect the population of plants in an area?
A Larger plants become the dominant organisms.
B Mosses replace flowering plants.
C Nitrogen-fixing bacteria kill young trees.
D Grasses become diseased.

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.