The first sand dollars formed during the period Paleocene. After that they diversified during the Eocene period.
Sand Dollars do not keep their babies with them. The babies are free floating from the time they are born. The Sand dollars do not even have gestation period for they just release the ripe eggs and sperm to be fertilized outside.
Sand dollars have these cilia or hair-like structures underneath them that are used like legs. They are used for locomotion and if they are not moving (especially for a long period of time), they are probably dead by then.
NO
Sand dollars do not mate. They spawn, i.e they shed their sperm/eggs in the water in groups. The spawning happens between August-November.
over time it will evolve depending on its environment
Dissolves??????????????????????????????????????????????????????????????
Ordovician Period
Cretaceous period
Cretaceous period,
No. Sand is made when waves crash against rocks over a very long period of time.
Sand dollars are marine animals that belong to the echinoderm family. They are formed through a process called metamorphosis. Initially, sand dollars start as larvae in the water, and as they grow, they develop a hard exoskeleton made of calcium carbonate. This exoskeleton eventually becomes the familiar round, flat shape we associate with sand dollars. Over time, the sand dollar's body adapts to its environment, allowing it to burrow into the sand and feed on small particles.
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