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What do you mean by positive interaction...

What do you mean by positive interactions between species?
Name the type of interactions involved in following examples :
(a) Ascaris in the gut of man.
(b) Tick birb and Rhinoceros association.

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MODERN PUBLICATION-ORGANISMS AND POPULATIONS -REVISION EXERCISES (IV. SHORT ANSWER TYPE - II QUESTIONS) (A. QUESTIONS FROM STATE BOARD EXAMINATIONS)
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