Who is the first discovered plants were made of cells?

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Explanation:

The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope.

the German botanist Schleiden proposed that all plants are made up of plant cells. Thank you.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex