1) Why environment is important for survival of a species? 2) Compare natural and man-made environments.
3) Distinguish between biotic and abiotic factors of environment.

4) How does human population growth and resource effect environment?
5) Is temperature important factor of environment? Explain.

Q1)Healthy ecosystems clean our water, purify our air, maintain our soil, regulate the climate, recycle nutrients and provide us with food. ... Even if certain species are affected by pollution, climate change or human activities, the ecosystem as a whole may adapt and survive

Q2)Man made environments are the artificially made environments made by man resembling natural environment.

Q3)Biotic factors are living or once-living organisms in the ecosystem. ... Introduction In ecology and biology, abiotic components are non-living chemical and physical factors in the environment which affect ecosystems.

Q4)More people require more resources, which means that as the population increases, the Earth's resources deplete more rapidly.

Q5)An environmental factor, ecological factor or eco factor is any factor, abiotic or biotic, that influences living organisms.

Explanation:

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.