What is excretion? What is/are the source/s of waste material? [2 MARKS]

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Solution

Each point: 1 Mark

1. The biological process by which metabolic wastes and harmful substances are removed from the body is known as excretion.
2. All the metabolic activities of the body produce waste material. e.g. cellular respiration generates carbon dioxide, breakdown of proteins leads to generation of nitrogenous waste etc.

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