3. • Dolphins - aquatic mammals of the order Cetacea, or
belonging to the family Delphinidae (Latin
Delphinidae) - sea or to the superfamily River
dolphins (Latin Platanistoidea) - freshwater.
4. Shark!!!
• Each species has its own particular life
expectancy, and difficult to assess it for all
sharks. Generally shark grow relatively slowly
and can generally be said that most of the live
20-30 years.