How does cell theory demonstrate the definition of theory?

The cell theory demonstrates the scientific definition of a theory in three ways. First it has been tested extensively then , it allows researchers who observes evidence of cellular structure in unknown objects to make predictions about the object such as it is a living thing and it can reproduce itself.  

Explanation:

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

thinking it would be d not too sure but i think it's right