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Sea water can also be polluted!
Marine environments are affected by human activities:
spillages of oil which can seriously reduce oxygen levels on the seabed as well as
reducing waterproofing properties of seabirds' feathers
radioactive compounds from cooling of nuclear power stations
temperature changes caused by global warming.
1 Detergents often contain phospholipid, which can be broken down to release
phosphate. Use this information to explain why we should not use too much
detergent and soap when washing clothes, cooking vessels and ourselves!
2 Explain the difference between negative and positive feedback.
27 Learning Module Organisms and Their Environment | Class 11
