develop a theory about the plant compare the plant to other plants observe the plant with a microscope determine the best growing conditions for the plant
I gave my students this multiple choice question: A scientist finds a plant and states that it is a new species. Which is the best way to verify that it is a new species?

Only one answer is correct among these 4 choices:
- develop a theory about the plant
- compare the plant to other plants
- observe the plant with a microscope
- determine the best growing conditions for the plant

Could you tell me which one is correct?

compare the plant to other plants