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Answer:
The fundamental unit of life is cell.
Cell was first discovered by Robert Hooke in 1665 in a simple microscope.
Animal Cell Structure
In 1674, Leeuwenhoek, with the help of developed microscope, discovered the free living cells in pond water.
In 1831, Robert Brown had discovered the nucleus in the cell.
In 1839, Purkinje used the term ‘protoplasm’ for the fluid substance found in the cell.
The cell theory was proposed by Schleiden (1838) and Schwann (1839).
According to the cell theory, all the plants and animals are composed of cells and that the cell is the basic unit of life.
In 1855, Virchow further expanded the cell theory and suggested that all cells arise from pre-existing cells.
In 1940, the discovery of electron microscope made possible to observe and understand the complex structure of the cell