Your nose and your mouth are both a portal of entry into your body. If you cover one and not the other it defeats the purpose because Bacteria can still enter the system. They are both part of your respiratory system.
Answer:
Pretty sure it's A because people can redo this test as many times as needed to verify the answer.
1. A
2. E
3. C
4. B
5. F
6. G
7. D
Answer:
Toxic chemicals is a major cause of water pollution. In most cases, the toxic chemicals came from the residual from production process after companies done making their product
Explanation:
