Why do scientists believe that there used to be a single continent, and what was it called?

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

Which statement best describes the role of religion and culture in ancient medicine?

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.