You can't tell, depending on the species it is. They can basically be any colour.
Neither. while its true that moon snails consist of only one shell, they are classified as gastropods and not bivalves. Bivalves are clams, mussels, scallops and oyster, all having 2 shells, while gastropods are snails.
no
Yes
Yes, it is true that the acidic ocean water will erode the calcium carbonate shells.
Sea snails eat moss and some plants that grow in water. that is a true answer that is not a lie it has been looked up soo yeah
true
Yes slugs are decomposers
true
it is a true and the oldest religion in the world this was 1700 before Christianity
True Apple snails Pomacea canaliculata can reach a Dia. of 6"
true
the oldest Representative democracy in the world is.................. Japan its true folks