Animals that mimic poisonous or dangerous animals use a defense called mimicry.

The statement which states that animals that mimic poisonous or dangerous animals use a defense called mimicry is true. These animals usually mimics other animals in order to escape from their predators. Mimicry is a behavioral adaptation that some animals used to escape been eaten by their predators, by mimicking they present themselves as dangerous animals that must be left alone.

The answer would be sand and gravel