Which of these observations helped scientists develop the Cell Theory?
A. All cells have DNA.
B. Many different types of cells have organelles.
C. Cells are modified for different functions.
D. All parts of a plant are made of cells.

Question

Which of these observations helped scientists develop the Cell Theory?
	A.	All cells have DNA.
	B.	Many different types of cells have organelles.
	C.	Cells are modified for different functions.
	D.	All parts of a plant are made of cells.

anonymous · Answer

its option d because cell theory is mainly based on one main fact  that all living organisms are made up of structural and functional units called cells and schleiden and schwann together presented the theory according to one it was the structural unit of all animals and to the other it was the structural unit of all plants

anonymous · Answer

To make it easy to understand, Schleiden and Schwann proposed 3 cell theory
1. All living things are made up of cells.
2. Cells are the basic unit of life
3. Cells come from preexisting cells. 

like what @warz said. :)