The pattern of ecosystem in which density and distribution of species vary along a horizontal gradient is
A
Zonation
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B
Stratification
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C
Ecological niche
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D
Speciation
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Solution
The correct option is C Zonation
The pattern of ecosystem in which density and distribution of species vary along a horizontal gradient is called zonation. In this process, classification of animals and plants is done on the basis of certain parameters characterised by its dominant species. These parameters are altitude, depth etc. Sedentary animals, seaweeds, encrusting lichens contribute to form zonation. So, the correct option is A.