Naturally sone ke koi tarike nhi.... You are nobita tumhe pta hona chahiye na xD
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Answer:
hehe...xD
Explanation:
Discovery. Contractile vacuoles ("stars") were first observed by Spallanzani (1776) in protozoa, although mistaken for respiratory organs. Dujardin (1841) named these "stars" as vacuoles. In 1842, Schleiden applied the term for plant cells, to distinguish the structure with cell sap from the rest of the protoplasm.
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