Please choose the correct answer to the question: A student observes cells in an object by using a microscope. The student thinks that the object was part of a living thing. Which statement explains why cell theory can be used to support the student's thinking?

Answer1: Cell theory was developed using a microscope. Answer2: Cell theory was developed to study living things. Answer3: Cell theory states that all living things are made of cells. Answer4: Cell theory states that scientists may classify things as living or nonliving.

Answer format: answer1/answer2/answer3/answer4
Answer: answer3