Answer:
it helps them have sex
Explanation:
yea you know heheheheh x0x
The answers are
1. nitrogenous
2. acid-base
3. fluid
Bright sunlight, lack of competitors, and more carbon dioxide
Answer:
The cilia is one of the things that act defensively in the respiratory system.
Explanation:
It propels a mucus-like liquid that covers the airway which traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs.