In order to better understand where leatherback sea turtles live, a scientist adheres a tracking device on a leatherback sea turtle's shell. this provides the scientist with the ability to track the turtle's movements throughout the day. the scientist finds that the turtle will periodically dive from the surface down to 1,280 meters (approximately 3,900 feet), which is deeper than any other turtle species dives. what ocean zones did the leatherbacks move between and why would a sea turtle migrate in this way?

epipelagic zone to the mesopelagic zone in order to avoid predation

epipelagic zone to the bathypelagic zone, where the primary food of jellyfish
exists in high abundance

mesopelagic zone to the bathypelagic zone in order to avoid predation

mesopelagic zone to the epipelagic zone, where the primary food of jellyfish exists in high abundance

Option D, Mesopelagic zone to the Epipelagic zone, where the primary food of jellyfish exists in high abundance

Explanation:

Leatherback sea turtles are found in deep seas. The depth upto which they can habituate goes beyond 1280 meters which is known as Bathypelagic Zone. This zone is known as the dark zone the which extends from 1000 meters to 4000 meters. There is no light and most of the animals that live in this zone are either red or black in color.  

The leatherback sea turtles live in this zone due to their different feeding habits. These turtle are accommodated with feeding in cold environment where temperature is quite low as compared to the zones where all other turtles feed.  Also, the kind of food (such as jelly fish) on which these turtle depend are found at greater depths.

it will increase due to the time span

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.