What month and what year did Matthias Schleiden contribute to the cell theory. Pl help

Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.

Explanation:

your answer is c

hope i ! ; )

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;