What are two solutions multicellular organisms use to maximize the surface area
of the cells?

What is thought to have caused the mass extinction at the end of the cretaceous period?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

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.