Answer:
C. Cytology is the study of cells, while histology is the study of tissues.
Explanation:
First Part of the Cell Theory:
All living things are composed of cells.
Second Part of the Cell Theory:
Cells are the basic unit of structure and function in living things.
Third Part of the Cell Theory:
All cells are produced from other cells.
The answer to your question is answer choice .1 Independent variable.
