The colour of chillies at the time of ripening changes from green to red.
give reasons​

Peppers can be eaten at any point of ripeness, but the color change in ripening peppers is caused by the degradation of chlorophyll, which occurs at the same time as the seeds mature.

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".