Elements 1 and 3 are used to make the most common substance in the body. what are these elements?

a. nitrogren & phosphorus
b. oxygen & hydrogen
c. hydrogen & helium
d. oxygen & sulfur

Types of scientific inquiry that biologist engage in that cannot be completely controlled

What’s the student’s scientific question

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.