"It helped to show that all plants are made of cells" help contribute to cell theory.
Option: A
Explanation:
In the period of 19th century, Matthias Jacob Schleiden supported to propose the cell theory in the place Germany. Cells were examined by Schleiden as the common characteristic between all animals and plants. With his invention of the Zeiss microscope lens and his research with cells and cell design as an organizing principle in biology, Schleiden extended to the field of embryology.
It had claimed that cells were constituted in plant tissue. The same idea was shown by Schwann for animal tissues. He proposed that all tissues consist of cells in 1839, this laid the groundwork for this cell theory. Also, Schwann experimented on fermentation and identified the pepsin enzyme.
