What is the significance of the discovery of exoplanets?
A. They may possibly be inhabited or harbor life.
B. They can provide natural resources for the future.
C. They help our understanding of the formation of planetary bodies.
D. They help calibrate GPS satellites.
E. They help understand the nature of the expansion of the universe.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

What type of graph presents information about how often certain or traits occur?

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.