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1. (a) Analogous Organs: Organs which performs similar function but are different in structure and origin. Example - wings of a bird and wings of an insect. Homologous Organ: Organs which have different functions but similar structure and origin. Example - fore arm of frog. lizard, bird and human.
2. Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.
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