an elephant's ears a plant's leaves a deer's hooves a tree's roots
I gave my students this multiple choice question: A solar cell turns sunlight into another form of energy. A solar cell is most like what natural structure?

Only one answer is correct among these 4 choices:
- an elephant's ears
- a plant's leaves
- a deer's hooves
- a tree's roots

Could you tell me which one is correct?

a plant's leaves