Question

sabko best of luck jinka bhi paper hai maen jaara school bye​

Answer 1

Answer:

mera paper noi h but marks pata chalenge subah...xD

Step-by-step 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.