They are different ages so that's hoe you know how old they are.
Sand dollar is like a starfish. It has a hard bony body covered by spiny skin. The skin has cilia, which helps in catching the organic material that comes near to feed on. There are male and female sand dollars seperately. Snad dollars live in a group on sandy sea beds. They are sometimes washed ashore. when threatened the sand dollars can burry themselves under sand.
There are several species of sand dollars found in marine ecosystems, including the common sand dollar (Echinarachnius parma) and the keyhole sand dollar (Mellita quinquiesperforata). These creatures are echinoderms that belong to the same family as sea urchins and starfish. Sand dollars are known for their flat, round bodies and distinctive five-part radial symmetry.
In the sand
You can not cheat to get sand dollars. You have to work for it, or you have to buy it.
Echinodermata (like sea urchins, sea stars, and sand dollars)
Sand dollars.
Sand dollars breathe through a process known as diffusion, using their tube feet.
sand dollars got there name because they are shaped like a coin and they dig themselves into the sand
Phylum Echinodermata
Sand dollars don't protect themself, they just sit their........ :)-
what is the sand dollars kingdom
Thier is five kind of Echinoderms, their is sea stars, brittle stars, sea cucumbers, sea urchins, and sand dollars.