Fact 1: Agreenhouse is used to protect plants by keeping them warm. Fact 2: Flower size varies by plant. Given the two facts above, how does a greenhouse protect flowers?
Select from: I. keeps them away from the sun; II. keeps them warm; III. keeps them out of soil; IV. an external framework; V. it needs them; VI. keeps them cold; VII. rays or beams; VIII. by indirect light;
Answer:
II.