Bacteria lives on the outside of foods, especially raw meats. When you cook a steak, you kill the outside bacteria making it safe to eat the pink insides since it won't be exposed to any bacteria. Hamburgers however are made of ground meat which, since it's ground, has been exposed to more bacteria. The meat is packed in a hamburger patty, but the inside has still been exposed to bacteria. You fully cook hamburgers to kill any lingering bacteria inside and out of the patty.
Answer: The first one, to keep the blood flowing in only one direction
I think the answer to this is false its usually tooth decay and cavities is the result of tooth lose.
<span>Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. The line of defense that is his immune system exhibiting is that of "(A) f</span>irst line of defense." There are only 3 lines of defense in the immune system. The first line of defense <span>are a combination of physical and chemical barriers that prevent all types of foreign agents from penetrating the outer layer of the body. In this case, it is the nasal cavity.</span>
