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

Explanation:

hey mate!

I think so its oxygen

Answer 2

Ans is

Hydrogen

is the correct ans