The respiratory system depends on the nervous system for signals to a - coordinate the muscles that control breathing. Indeed, our nervous system plays a vital role when it comes to many bodily aspects where we don't even appreciate them on a daily basis. They are, however, extremely important.
Asbestos, tobacco smoke, and formaldehyde are a few common examples
I think that for 1 it’s either A or B as the kidneys and everything get air and the lungs release it.
For 2 is probably D as the others don’t really make much sense.
A, bacterial conjugation
Explanation:
I think it's this because in step 4, the things under the oval-ish circle looks like bacteria
