D because destroying toxens and destroying tissues are caused by bacteria
Answer: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.
Explanation:
<span>It is the biosphere, which includes all living organisms and ecosystems is the highest physical level of biological study.</span>