The state of maintaining a stable internal environment regardless of changing external conditions is called
.

Answer:
The leatherback is the largest living sea turtle.
Explanation:
The Leatherback is the largest sea turtle existing today, which can reach up to 2000 pounds in weight and 8 feet in size. These turtles belong to a reptilian family that has been around for more than 100 million years.
Cell membrane is the answr
This is called Biomagnification - concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed.