You are aboard a research submersible diving along an underwater cliff face. The pilot stops at three different depths and asks you to report what you observe. At each stop, you encounter creatures you have never seen before. Write a research log entry describing: (1) two deep-sea creatures you observe, including at least one specific adaptation each creature has for surviving in that environment, and (2) how you would go about classifying each creature into the correct animal group based on its physical features.