How do you think about the invention of the microscope? Influenced the cell theory? And what are the components of the cell theory?

2)Cell Structures under the Microscope

The microscope was improved and modified for better observation of different cells and microscopic organisms. As a result, cell theory was created and modified to be what we know today. The physiological and biological study of cells focuses on cellular structure and function.

3)Cell theory states that living things are composed of one or more cells, that the cell is the basic unit of life, and that cells arise from existing cells.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.