9. (06.05 MC)
Which of the following best describes a factor in the evolution of plants that led to their success in surviving on land? (2 points)
Xylem developed to transport water from the plants roots to the rest of the plant.
A waxy cuticle developed to prevent plants from being eaten by herbivores.
Stomata developed to allow water to enter the plants leaves from the atmosphere.
Seeds developed to provide a place for the plants genetic information to be stored.

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.