The statement "Only animals are composed of cells" is NOT part of the cell theory.
The following statements are part of the cell theory:
a. Cells are the basic unit of structure and function in living things.
b. All cells are produced from other cells.
d. All living things are composed of cells.
The cell theory was based on the advances made by means of observation apparatus initially due to Robert Hooke (1635-1703) and Antoni Van Leeuwenhoek (1632-1723).
The cell theory states that absolutely all living beings are made up of cells. This includes all organisms in our planet.
In other words, all forms of life are cell-based, meaning that all plant, animal and fungal tissues can be broken down into individual cells, although unique and differentiated.
Therefore, we can conclude that the cell theory focused on the cell as the minimal structure of life and that all organisms are composed of them.
Learn more about cell theory here: https://brainly.com/question/13380999
