Which of the following statements describes a proton of an atom? a has a negative charge and is located in the nucleus. b has no charge and is located in the nucleus c has a positive charge and is located in outer energy levels. d has a positive charge and is located in the nucleus

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.

Why are current extinctions of concern to enviromentalists?

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping