Sand dollar itself is a live hard echinodermic creature.
They Live under the sand
In the sea.
No, a sand dollar would be made up of many cells.
They weigh the same as they did the first day on the sand.
No
IN THE SUNLIGHT ZONE IN THE ATLANTIC OCEAN
They live in the sunlight zone
1 pound.
that depends on th type of sand
A sand dollar was called a geopolitical dollar
10pounds