They are all multicellular. They all reproduce sexually. They all produce their own food. They all have membrane-bound nuclei.
I gave my students this multiple choice question: How are organisms classified as Eukarya different from organisms classified as Archaea and Bacteria?

Only one answer is correct among these 4 choices:
- They are all multicellular.
- They all reproduce sexually.
- They all produce their own food.
- They all have membrane-bound nuclei.

Could you tell me which one is correct?

They all have membrane-bound nuclei.