What did Zacharias Janssen do for the Cell Theory?

What are the example for protective foods? What harm does Clorox spray do if get in your eyes? What is the alignment of the medial and lateral malleoli relative to each other? How much blood does a laparatomy sponge hold? How does a cell's organelles know what to do? What is the adaptation of a leaf? How is each nucleotide different from other? When someone accidentally slams the kitchen door Andrea flings out her arms and legs and then brings them close to her body Which reflex is this newborn exhibiting? Meiosis starts with a single diploid cell and produces? How is a molecule different from an atom or element? Why is a rose a living thing? How is co2 removed from the body? Which cellular compartment contains the greatest amount of body fluid? What biomolecule is represented by DNA and RNA? Which of the statements best describes what will happen if a fresh water bacterias cell is put into a hypertonic salt water environment? What is the recommended disinfectant for blood and body fluid contamination is? What marginal zone of the epiphyseal plate where in children and adolescents bone can be seen replacing the hyaline cartilage? Can you reject your own bone marrow? Is the coronoid fossa on the lateral and posterior side of the humerus? Where is the Carina located in the human body?

What did Zacharias Janssen do for the Cell Theory?