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Competition for light, nutrients and space is most severe between

1. closely related organism growing in different niches
2. closely related organisms growing in the same area/niche
3. distantly related organisms growing in the same habitat
4. distantly related organisms growing in different niches

Correct answer: closely related organisms growing in the same area/niche

Solution

Closely related organisms usually have very similar requirements for light, nutrients, and space, so they overlap heavily in what they use. When they live in the same niche or area, that overlap makes competition most intense.

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