Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: The bottom of the ocean is called the benthic zone. It includes the sediments on the bottom of the ocean and the water just above it. Organisms living in this zone include clams and crabs. They may be few in number due to relatively scarce nutrients in this zone. Answer: the benthic zone
Output:
The bottom of the ocean is called what?