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What is the 'keel' of a vessel?

  1. The top edge of the vessel

  2. The bottom interior of the vessel

  3. Main centerline or backbone of a vessel

  4. The rear part of the vessel

The correct answer is: Main centerline or backbone of a vessel

The keel of a vessel is the main centerline or backbone that runs along the bottom of the boat. It helps to stabilize the vessel and to control its direction and movement. Option A is incorrect because the top edge of the vessel is called the deck. Option B is incorrect because the bottom interior is usually referred to as the bilge. Option D is incorrect because the rear of the vessel is referred to as the stern.