happens at regular times - periodical, not normal - unusual, come out, become know - emerge, irritate - annoy, stop from happening - prevent, large areas of land. - region, harm that reduces usefulness or value. - damage, when a type of animal or plant stops existing. - extinction, related to how living things slowly change over time. - evolutionary, something that helps you do better or get ahead. - advantage, insects known for their loud sounds. - cicadas, a young insect that isn't fully grown. - nymph, all the young born at the same time from the same mother. - brood, the stages of growth and change an organism goes through in its life. - life cycle, when many cicadas sing together. - chorusing,

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