5. Cells that police the body in blood and lymph to kill cancer cells and virus-infected body cells are called natural killer cells.
antibodies.
antigens.
histamines.

In some states, medical marijuana is legal. this means that people who need to take marijuana because of a medical condition may take it only with approval from the doctor. however, officers still advise these people not to drive while under the influence. what is the main reason for this? they would become dangerous to themselves and other people. they would not able to read and follow street signs. they would not be capable of staying in only one lane. they would become dangerous to wildlife that may be present.

Can someone give me a hand with this one.

When comparing the digestive and urinary system, we can conclude that they both