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
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No. Sand is made when waves crash against rocks over a very long period of time.
Ordovician Period
Cretaceous period,
Cretaceous period
A sand dune is a hill of sand that was built up by an obstacle such as a rock and had sand blowing over it in one direction for a period of time. Over that period of time it builds up and gets gigantic and then sometimes collapses. People often visit these amazing sites. A sand dune is a sandy mountain in a desert or at a beach along the shore of an ocean.
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