English, asked by ayyanbudye1, 1 month ago

Essay on Natural calamities and steps to be taken for rescue and relief

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Answered by itzvaish08

0

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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