FROM EXCEDRA:
No it,s a puke shell of course it,s a sea shell you idiot!
Yes sand dollars are a kind of sea urchins that are flattened and can burrow itself.
the child find the sea shell lying on the sand
In the sea.
Sand dollars are living organisms, similar to starfish or sea urchins. When you see them on the beach, you mostly see what is left of them after they die and decay, their calcium carbonate shell.
The sand dollar (Clypeaster sp. Family Clypeasteridae) a flat, round type of sea urchin, is specially adapted to burrowing in sand. The star shape is due to its set of five pores arranged in a petal-like pattern through which it moves sea water into its internal water-vascular system. It's the latter that allows the sand dollar to move about. A link is provided below.
Sand dollar is not a limestone. It is a living thing found in the sea. They are a kind of sea urchins which are round and flat. The flat portion is its bone which is called the test.
sand dollar adaptaions is when a sand dollar adapts to its new environment under the sea. As simple as that.
Sand dollars are like God's eyes in the sea
Click on the link for a picture on a different website.
A sea dollar R
A sand dollar is a shell left behind by a flat relative of the sea urchin. Sand dollars typically have five semi-leaf shaped markings emanating from the center to the mid-line of the circular structure.
A sea dollar R