Which of the following would not be considered a stage of speciation? mutation and natural selection occur changing a population from previously similar ones populations are separated geographically fertile offspring are produced a population acquires new traits making it different from a previously similar population

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

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.

2points what do bacteria have in common with the cells of other living organisms?