Im confused what the question is but can still help if u comment, scientific method project?
answer:
we can't pollute water because there are creatures and organisims that live in the water so if we pollute it then they will die, besides you can filter the water to get rid of salt then you're able to drink the water and also use it for many other purposes.
Answer:
an autotroph is a <em>producer</em> in the food chain
Explanation:
An autotroph produces its own food from light, heat, and/or environmental chemicals, often including water and/or carbon dioxide. It is a <em>producer</em>, not a consumer, in the food chain.
Answer:
not sure about the answer
a change or difference in condition, amount, or level, typically with certain limits.