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 Form 3 Biology questions and answers on ecology

(a) State three effects of dumping untreated sewage into a river.
(b) Name one process that is responsible for loss of
energy from one trophic level to the next.

 (1m 2s)
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Answer Text:
(a) - Leads to eutrophication
- Kills organisms in water
- Causes water borne diseases for example, cholera
- Changes the water PH

(b) - Respiration
- Defecation
- Excretion


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