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Sharks and dolphins live in seas and oceans, but sharks are fish and dolphins are mammals. Dolphins are 1 (bardziej inteligentne niż) ____________________ sharks and they are 2 (lepsze niż) ____________________ sharks at learning. Both sharks and dolphins are good swimmers, but usually dolphins are 3 (szybsze niż) ____________________ sharks. Of course, sharks aren’t 4 (tak przyjazne jak) ____________________ dolphins – in fact, they can be very dangerous! But not all of them. Some shark species are 5 (mniejsze niż) ____________________ other fish, like the Dwarf Lantern Shark, which is only about 17 cm long.