robert hooke used a simple microscope to observe what

Robert Hooke used his simple microscope to observe a wide range of things, but he is most famous for his observations of plant structures.

Here are some of the things he observed:

• Plant cells: He coined the term “cell” after observing the structure of cork under his microscope.
• Insects: Hooke examined various insects, providing detailed illustrations of their anatomy.
• Fungi: He made early observations of microscopic fungi.
  Other tiny organisms: Hooke explored the previously unseen world of microorganisms.
  His groundbreaking work, published in the book Micrographia, opened up a new realm of scientific exploration and laid the foundation for the study of biology.