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3. A group of individuals belonging to the4. Different kinds of ecosystems together constitutebios5.In a parasitic food chain, the pyramid of number will beIII. Answer the following:V.List the factors which have made life exist on earth.2. Define the following-a. Lithosphereb. Populationc. Biotic community d. Food web e. Trophic levestnd3. What is an ecosystem?4. Why is the use of DDT not advisable?15. Construct a simple food chain.non if all herbivores are killed in a terrest​

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