The answer is B I believe it to be
Answer: An atom is the smallest unit of ordinary matter that forms a chemical element, they are like building blocks because they form together to make up everything on this earth.
Explanation:
i done know my way around this here terrain
Because you cannot test it or observe it.
A scientific theory are created through the scientific method, in the scientific method you need to be able observe it and experiment.
Option D centrioles helps cells to divide.
