Here's why:

* Hooke's Observations: While examining a thin slice of cork under a microscope, Hooke observed small, box-like compartments. He named these compartments "cells" because they reminded him of the small rooms monks lived in.

* Early Microscopes: Hooke's microscopes were relatively primitive, so he could only see the cell walls of dead plant cells.

* Later Discoveries: Later scientists like Anton van Leeuwenhoek (1674) and Matthias Schleiden (1838) furthered our understanding of cells by observing living cells and developing the idea that all living things are made up of cells.

So, while Hooke is credited with the initial discovery of cells, the understanding of their importance and structure evolved over time thanks to many scientists.