What is a vaccination? It's not A a) an injection of a chemical formula that forms a shield around bacteria
b) an injection of a full-strength form of bacteria that causes a disease
c) an injection of weakened bacteria that creates immunity to a disease
d) an injection of blood taken from another person who has no bacteria

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!