https://padlet.com/carmencitacobreros/sp610jrzps7h Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays. Sharks have diversified into over 500 species. en-us 2016-05-08 13:40:33 UTC 2016-05-08 14:05:10 UTC hello@padlet.com carmencitacobreros https://padlet.com/carmencitacobreros/sp610jrzps7h/wish/109746933 Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, andpectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) ]]> 2016-05-08 14:04:30 UTC https://padlet.com/carmencitacobreros/sp610jrzps7h/wish/109746933