This phrase belong in Y on the diagram.
D. In Y
Explanation:
The Venn Diagram represents the work of Scientists, Schleiden and Schwann. Schleiden worked in the year 1838 and Schwann in the year 1839. Both Scientists studied cells and used microscope for carrying out the experiments. Schleiden was a Botanist and thus studied plant cells. Schwann was a Zoologist and thus studied animal cells.
Both of them contributed in proposing cell theory. Thus, Y marked region shows Schwann studied animals. The X region shows the study of Schleiden on plants. Z is the intersection area which shows studies of both the Scientists.
