Question

ajj ke liye itni sucess kafi hai..phir. milenge kbhi kisi aur I d pe. ....tab tak good bye​

Answer 1

Answer:

nice...xD

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.