<prompt> Fana ka kakaretso e khutsoane ea litaba tsa sengoloa ka mantsoe a ka tlase ho 100.Maruarua ke sehlopha se ajoang ka ho pharalletseng le sa mefuta e fapaneng sa liphoofolo tse anyesang tse phelang metsing tse phelang metsing. Ke sehlopha se sa reroang ka hara infraorder Cetacea, eo hangata e sa kenyelletseng li-dolphin le porpoise. Li-whale, li-dolphin le li-porpoise ke tsa taelo ea Cetartiodactyla, e nang le li-ungulate tse nang le menoana e lekanang. Beng ka bona ba haufi-ufi ba phelang bao e seng li-cetacean ke likubu, tseo tsona le li-cetaceans tse ling li khelohileng ho tsona lilemong tse ka bang limilione tse 54 tse fetileng.  <response>: Instruction in English: Provide a short summary of the article content in fewer than 100 words. . Response in English: The article describes whales as fully aquatic mammals that belong to the infraorder Cetacea, usually excluding dolphins and porpoises. These animals, along with dolphins and porpoises, fall under the order Cetartiodactyla and their closest non-cetacean relative is the hippopotamus. The divergence between whales and hippopotami happened about 54 million years ago. . Response in Sesotho: Sengoliloeng se hlalosa maruarua e le liphoofolo tse anyesang tse phelang metsing ka botlalo tseo e leng tsa infraorder Cetacea, hangata ho sa kenyeletsoe li-dolphin le porpoise. Liphoofolo tsena, hammoho le li-dolphin le li-porpoise, li oela tlasa taelo ea Cetartiodactyla me beng ka bona ba haufi-ufi ba sa cetacean ke kubu. Phapang pakeng tsa maruarua le likubu e etsahetse lilemong tse ka bang limilione tse 54 tse fetileng. 