Adaptations help an animal to survive so that it can reproduce. They make the animal better at moving, feeding, hearing, smelling, surviving when food is scarce, escaping predators, reproducing, etc. For example, flippers, flukes, lungs, a dorsal fin, and a blowhole are some of a dolphin's adaptations. Show the class photographs in the photo album and on the disk of dolphins. Discuss how humans are part of the ocean ecosystem, and people can alter the ecosystems.
Human activities can accelerate environmental changes.
Be changing the environment, we have the ability to completely destroy a habitat to which an animal is adapted. The environment we leave behind may be so different from the animal's habitat that the animal lacks the adaptations necessary to survive there. If there are no members of the population that can survive the environmental change, the entire population will become extinct. Brust, Beth Wagner. Dolphins and Porpoises Gay, Tanner Ottley.