Scientists should determine methods to test their hypothesis. If a model cannot be disproved, it is not science. Experiments are designed then performed Models that fail the tests are modified or rejected. Fires require oxygen and never burn as long as the Sun has been shining. We can give the drug to people with that type of cancer and see if they are cured.
All theories are subject to further testing.
Next we'll apply the scientific method to a simple question, and learn how to design good experimental tests. A talked-to plant will grow more and better. A good hypothesis would also explain why. Maybe your house is just a good environment for plants. We'll talk to one plant but not to the control.