Answer:
The three types of lymphocytes are T cells, B cells, and natural killer cells. The T cells destroy pathogens in a specific manner and activate B cells to produce antigen-specific antibodies. Phagocytes can be either macrophages, neutrophils, monocytes, dendritic cells or mast cells.
Explanation:
The urine remain in the bladder because valves prevent backflow
Answer:
The median is usually preferred to other measures of central tendency when your data set is skewed (forms a skewed distribution) or you are dealing with ordinal data.
An individual was exposed to a contagious disease but did not become infected. The agent was unable to enter the body and grow because it was stopped by
the person's skin. This is an example of how a antigen can prevent disease.
