Which pair of scientists should Elizabeth write instead of X

and Y?

O Schwann and Hooke

O Hooke and Schleiden

O Hooke and Leeuwenhoek

O Virchow and Schwann

O Hooke and Leeuwenhoek

Explanation:

O Hooke and Leeuwenhoek discovered the existence of micro organisms between 1665 and 1683

O Hooke and Leeuwenhoek

Explanation:

The scientists, O Hooke and Leeuwenhoek were prominent scientists.  In fact, they are credited with being the pioneers of science especially the field of microorganisms. To be more specific, the two great scientists discovered what are known as protozoa. This was done specifically by Van Leeuwenhoek who discovered the single celled protozoa ,which were termed animalcules. In addition, the most prominent feature of the research and discovery was Leeuwenhoek's use of a self-designed microscope.  

d.7.5cm is your answer

answer and explanation;