While looking on an eroded hillside for fossils, youdiscover coral and fish in one layer. in a layer just above, youfind imprint of a fern frond (leaf) and some fossil moss. assuringthe rock has not been disturbed, which of the following is the mostprobable conclusion?

a)the area had been sea until recent times
b)a forest had once grown there but had become submerged bywater.
c)a sea had replaced by land in anceint times
d)a salt water sea had been replaced by freshwater in ancienttimes.