Answer: Cell is the basic structural and functional unit of the body of the organism.
Step-by-step explanation:
The cell theory is related to the discovery of the cells proposed individually by Schleiden and Schwann who studied the plant and animal cells individually. They proposed that all organisms are made up of cells and the cells are the building blocks of the cells. The cell for the first time was discovered by Robert Hook in 1665 under the self constructed microscope in the thin slice of the wood.
Ernest McCulloch and James Till they conduct the experiment to obtain the special type of cells called stem cells from the bone marrow of the mice. These cells have the ability to divide and differentiate at a faster pace.