The cell theory was constructed by

robert hook

schleiden and schwann

carolus linnaeus

The cell theory was constructed by Schleiden and Schwann.

>Matthias Jakob Schleiden  was a German botanist and co-founder of the cell theory, along with Theodor Schwann and Rudolf Virchow (not really credited towards it, he is a contributor to the said theory.
>Robert Hook---largely attributed the cell theory;started the study of cells known as the cell biology.
>Carolus Linnaeus---a Swedish botanist, physician, and zoologist, who formalized the modern system of naming organisms called binomial nomenclature.

If you want the answer you need to post the figure above that it's talking about and you