The absence of alimentary canal in the parasitic flatworm can be attributed to the fact that

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The following organisms are pests of plants except

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Ascaris lumbricoides is a parasitic

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Rhizobium which lives in the root nodules of leguminous plants is an example of the association known as

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The main reason for immunizing children is to

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A pyramid of numbers is constructed by

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The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as

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The frog is considered a better swimmer than the toad because it

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The producers in a food chain in an aquatic environment are

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The maximum size of a population that a given area can support is known as

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Ecology simply means the study of

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Which of the following associations is an example of epiphytism?

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