because they are
No animals lived in underwater Ohio since it was underwater. They had to be fish, but no mammals.
sealife creature / sealife animals / sealife / underwater mamals / underwater creatures
Henry's Amazing Animals - 1996 Underwater Animals - 3.6 was released on: USA:6 January 1996
No
snorkles.
Arapaima.
crabs
gills
limestone is made underwater from the shells of animals. We know this because limestone also contains many fossils.
Their gills.
i seriously don't know
sharks