1. Upper jaw 2. Mouth 3. Lower jaw 4. Vocal cords 5. Esophagus 6.stomach 7. Liver 9. Small intestine 11. Duodenum 12. Stomach lining 14/16. Large intestine 18. Rectum 19. Anus
The answer is the second choice: variation, overpopulation, adaptation
Answer: The systems regulate the house, the same way our body system helps regulate our body. If it wasn’t for the electrical system, plumbing system, heating, and cooling system the house wouldn’t be regulated or able to live in. Just like if our bodies isn’t being regulated, we can't live.
I hope this could help you! ^^
Not always, the toxins may have been absorbed by the body and released in urine