I think its the system cell mah dude in other words its the T-CELL
It helps prevent illness because they washed their hands and if they didn't 1 that would be nasty and 2 no one want pee or poop on their food that they are going to eat.
Answer: Prolactin
Explanation:
By the 5-6 month of pregnancy the breasts becomes ready to produce milk or colostrum. During the late stages of pregnancy, the women breast enter into the lactogenesis first stage. The level of prolactin rises. After birth the prolactin levels remains high the breast is stimulated. The release of prolactin triggers the cells present in the alveoli of the breast to secrete milk.
No because everyone is born with different blood cells