Concept:Camouflage allows an organism to blend with its surroundings and avoid being seen by predators.Explanation:When a predatory fish is introduced, the variety that stands out most among the water plants will be eaten most easily.Variety R does not have a colour that blends with the water plants.This makes R more visible and more likely to be attacked by the predator.So, variety R is likely to decrease most in number.Answer:C. R
