Why does the increased level of nutrients in the water affect survival of aquatic organisms ?

How can the change in pH in the river water affect the living organisms ?

Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.

We know that many human activities lead to increasing levels of pollution of the air water bodies and soil . Do you think that isolating these activities to specific and limited areas would help in reducing pollution ?

Why do organisms need water?

Why does a block of plastic released under water come up to the surface of water?

Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?