Concept:Camouflage helps an organism blend with its surroundings to avoid predators.Explanation:The variety most likely to survive is the one that matches the water plants most closely.Variety Q shows striped markings that resemble the pattern of water plants in the river.This makes Q less visible to predators.As a result, Q is less likely to be eaten and more likely to live longer than P, R, and S.Answer:B. Q