Answer:
Diseases of the immune system are especially dangerous because they attack the very cells that destroy other diseases. AIDS (auto immunodeficiency syndrome) basically makes the immune system kill itself. Basically, white blood cells kill other cells, (including its own white blood cells) instead of killing viruses or bacteria, in turn making your immune system very weak. If your immune system is weak, a simple cold can turn into a nightmare, and can even result in death.
A joint is surrounded by a hollow area that is called a synovial capsule.
<span>False.</span>
The first trimester is when the embryo attaches to the placenta by the umbilical cord and the placenta make contact with the uterus.
