From an evolutionary standpoint, plants want their fruits and berries to be eaten by animals. The energy spent on creating all that tasty sugar pays off when seeds survive the animal’s digestion and get left in a pile of fertilizer, usually some distance away from the parent plant.
So, fruits and berries want to be seen by animals that might eat them in the same way that flowers want to be seen by bees and other pollinators. A bright, shiny, red apple will be seen easily among green leaves.
Additionally, bright colors are a sign of a healthy fruit (less likely to be diseased or infected), which entices animals even more.
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