Two species of frogs belonging to the same genus occasionally mate, but the embryos stop developing after a day and then die. These two frog species separate by .

a. hybrid inviability
b. hybrid breakdown
c. hybrid sterility
d. gametic isolation
e. adaptation

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.

Which describes a grizzly bear’s habitat?