Explanation:
HIV attacks a specific type of immune system cell in the body. It's known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections. When HIV is left untreated, even a minor infection such as a cold can be much more severe.
<span>Exposure to mutagenic agents</span>
100%
If only one parent has sickle cell allele, then the child won’t get sickle cell disease. However, if both parents have sickle cell allele, then the probability of their child having the disease is pretty high
Progesterone and estrogens are thought responsible for the release (and prevention of release) of an egg during ovulation
Answer:
gravity
Explanation:
gravity pulled the ball down so that's why it hit the ground
