Answer:
To moisten and to protect the airway from stuff like unknown pathogens and infection
Explanation:
The Trachea also known as the windpipe has tons of 'little hairs' called cilia in the epithelium that protect the throat. When someone smokes or breathes in gases it is destroyed and exposes the trachea. But thats another story. :)
Answer: 1. founder effect
2. evolution
3. natural selection
4. species
5. geographically isolated
Explanation: Good luck! :D
The deep organs
Hope this helps :)
Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
Answer:
an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Explanation:
