Question

*When water becomes unclean and poisonous due to mixing of natural or artificial unwanted material, the amount of ___________ decreases.*

1️⃣ Nitrogen
2️⃣ Oxygen
3️⃣ Hydrogen
4️⃣ Carbon dioxide​

Answer 1

Answer:

2. oxygen

Explanation:

please mark it as brainliest and follow

Answer 2

Answer:

Oxygen

Explanation:

The amount of oxygen decreases this can be observed because a dirty lake has no fish