Well, it depends but adults can weigh up to 420,000 pounds
I believe its large blue vessel also known as vena cava
Answer:
sunlight entering the water may travel about 1,000 meters (3,280 feet) into the ocean under the right conditions, but there is rarely any significant light beyond 200 meters (656 feet). The ocean is divided into three zones based on depth and light level. The upper 200 meters (656 feet) of the ocean is called the euphotic, or "sunlight," zone.
Explanation:
hope this helps