Sharkshavelivedintheoceansforover450millionyears,longbe...
問題詳情:Sharkshavelivedintheoceansforover450millionyears,longbeforedinosaursappeared.Therearenowabout360speciesofsharks,whosesize,behavior,andothercharacteristicsdifferwidely.Everyyear,wecatchandkillo...