CHEGG The mechanism of macroevolution occurs by:. a. appearing in the fossil record of species with similar morphologies.
b. multiple acts of speciation on an ancestral organism.
c. weakening of barriers to reproductive isolation.
d. continuation of gene flow between populations.

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.

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture

The climate on the leeward side of a mountain differs from that on the windward side mostly in