How you can define the term 'cell"?

Explanation

**Step-by-Step Solution:**

1. **Definition of Cell**: A cell is the basic structural and functional unit of all living organisms. It is the smallest unit of life that can replicate independently and is often referred to as the building block of life.

2. **Historical Context**: The term 'cell' was first introduced by the scientist Robert Hooke in 1665. He observed cork under a microscope and noted the presence of small, box-like structures, which he termed "cells" because they reminded him of the small rooms (cells) in a monastery.

3. **Observation of Cells**: Hooke's observations were limited to dead cells, as he was examining cork. He could only see the cell walls, which are the outer coverings of the cells. He did not observe the contents of the cells.

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