Answer:
the answer for me is the third option (c)
Answer:
The human respiratory system contains the organs that allow us to get the oxygen we need and to remove the waste carbon dioxide we do not need. It contains these parts: two lungs. ... various structures in the chest that allow air to move in and out of the lungs.
I’m pretty sure it’s B. Relative saying
I think it’s all of the above because they can all be found in the air and in water sources
The answer u r looking for is- D* failure of the immune system to distinguish self from nonself. Hope I’ve helped ;)
