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.
gills
crabs
limestone is made underwater from the shells of animals. We know this because limestone also contains many fossils.
Some mammals and the animals that live underwater are the animals that have pinna's. The animals that crawl on the ground also have pinna's.
Their gills.
sharks