Answer:
A Starfish is Triploblastic meaning they consist of three germ layers. Hydra are diploblastic meaning they consist of only 2 germ layers.
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<em>Merit-Ptah
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<em>Ancient history. The involvement of women in the field of medicine has been recorded in several early civilizations. An ancient Egyptian physician, Merit-Ptah ( c. 2700 BC), described in an inscription as "chief physician", is the earliest known female scientist named in the history of science.</em>
Mosses were one of the first plants to even evolve.
