Pcan sombody tell me three questions on air and water pollution

Well,

You can ask about carbon dioxide levels.

"Will the rise in carbon dioxide levels threaten human existence?"

For water pollution, you can ask about how to track pesticides.

"How can we effectively track pesticides to their source?"

"How will we meet the growing demand for water?

1. the answer is a parasite

What? are u trying to do a genetic test?