AP BIOLOGY

Detailed explanation-1: -Note: Bacteria, algae and fungi are the unicellular and multicellular organisms that show the complete definite cellular structure with cell organelles, produce energy by burning food and reproduce. So, all are living organisms and come under cell theory.

Detailed explanation-2: -The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life.

Detailed explanation-3: -The cell theory states that all living things are made of cells, cells are the basic units of structure and function of living things, and that all cells come from other cells. Since viruses are not made of cells, and do not use cells in any of their processes, they are not related to the cell theory.

Detailed explanation-4: -Cell theory states that: All organisms are composed of cells. Cells are alive and the basic living units of organization in all organisms. All cells come from other cells.