According to the text, how long have sharks been around for?

n.dekoch

ana.rodriguez_r

mccann_jackalyn

uma.krishnamurthy

paulm

sunny.lagmay

liafisikanasution90

kharrelson

jim_caudill

neseloja

sbarr

holly

holly

ankita.sharma

Mrs Wallace

lsusie

vcarnero

holly.easterling

holly.easterling