Question

Which of the following sources of pollution decrease the oxygen level of water? Select the two correct answers.(1 point)
Responses

radioactive substances
radioactive substances

gasoline
gasoline

animal manure
animal manure

plant fertilizer
plant fertilizer

toxic metals

Answer 1

The two sources of pollution that can decrease the oxygen level of water are:

1. **Animal manure** - This can introduce nutrients that lead to algal blooms, which consume oxygen as they decompose.
2. **Plant fertilizer** - Similar to animal manure, fertilizers can also cause nutrient pollution, leading to algal blooms that deplete oxygen levels in the water.

So the correct answers are **animal manure** and **plant fertilizer**.