Answer;
- Cellular structure
According to cell theory, scientists do not classify a virus as living because it does not have cellular structure. Viruses have a simple cellular structure.
Explanation;
-Cell theory states that all living things are composed of one or more cells; a cell is the smallest unit that still retains the properties of life; and new cells only come from cells that already exist.
Viruses have a simple cellular structure. The new definition makes no reference to cells or organelles. Instead it uses the term "unit". A molecule could be a unit. A crystal could be a unit. A cell could be a unit.