Cell theory consists of three parts. Since all of these parts are __________ by extensive evidence and describe a phenomenon in nature, they are considered to be a scientific theory. The first part of the theory describes how all __________ are made of cells. The next part of the cell theory explains how cells __________ to form new cells. Lastly, the cell theory states that __________ are the most basic unit of any living thing. This means that cells are the __________ thing that is alive.

Cell theory consists of three parts. Since all of these parts are supported by extensive evidence and describe a phenomenon in nature, they are considered to be a scientific theory. The first part of the theory describes how all organisms are made of cells. The next part of the cell theory explains how cells divide to form new cells. Lastly, the cell theory states that cells are the most basic unit of any living thing. This means that cells are the smallest thing that is alive.

Explanation: Cell theory is a fundamental concept in biology, establishing that all living things are composed of cells, that cells arise from pre-existing cells, and that cells are the basic building blocks of life. Each part of the theory is backed by extensive scientific research and observation.