|Class 9 Biology Fundamental Unit of Life||Introduction|
Every organism in this universe are made of tiny basic structural units called cells.
Cells were discovered by Robert Hooke in 1665.
Cells are the building blocks of an element that cannot be seen with naked eyes but can be seen under a microscope.
Every living-element is made up of numerous tiny cells.
There are some single celled organisms as well that live on their own.
Organisms can be classified into unicellular and multicellular organisms depending upon the number of cells present in their body.