8. Adaptation and independence

Question 1

What can sewage and fertiliser cause if they enter water?

Answer 1

Eutrophication

Question 2

What is Eutrophication?

Answer 2

An increase in the concentration of mineral ions (fertiliser) in the water stimulates the growth of Algae and plants
Eventually these begin to block the light to other plants preventing them from photosynthesising so eventually these organisms die
The population of microorganisms increases as they feed on the dead organisms
Respiration of these microorganisms depletes the oxygen levels and aerobic creatures die