i) Caudal fin - For swimming. ii) Operculum .- For protecti iii) Dorsal fin - For defense iv) Lateral line - For sensing

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.