Answer:
850 meters
Explanation:
From the base of the epipelagic zone to a depth of about 850 meters, there is still enough light for a human to see. The second zone between 200 meters and 1,000 meters is known as the "twilight zone". Some light penetrates as far as 1000 meters down into the ocean.
Heart rate or pulse I think.
Answer: D. It increases the bird's chances of finding a mate.
Explanation:
As the question states, it's beautiful for the mate to see.
Because they have no competitors in any echological niche
