It's good to be in positive energy balance when you're
a. recovering from the flu.
b. beginning an exercise program.
c. a fully grown adult in good health.
d. trying to deal with stress.

Which statement is true about common childhood infectious disease? a. children should always be given antibiotics to treat an infectious illness. b. frequency of infectious illnesses usually increases as children grow older. c. having a minor infectious illness weakens a child's immune system. d. infectious illnesses are usually mild and require no medication.

Which of the following leukocyte is not correctly matched with its function? -basophils: inflammation -lymphocytes: immune response against viral infections -monocytes: develop into macrophage -neutrophils: produce antibodies

Explain why many people are concerned about uv rays? explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?