Adaptations-. Black bears have a thick layer of fur for the cold winters,claws to climb trees and stay away from danger along with sharp teeth for protection like scaring away predators and to tear apart fish.Bears also hibernate in the winter to avoid having to find food which is difficult in the winter.
The cell membrane, or plasma membrane, surrounds and protects the internal environment of a cell; however, this is not its only function. A cell membrane also determines what materials enter or leave the cell. This ensures that the cells will be able to get rid of wastes and take up important nutrients and gases.
The plasma membrane is essentially a barrier that separates the interior of the cells from the outside environment. Plasma membrane is also known as a cell membrane. Plasma membranes are present in all kinds of cells, including both animal and plant cells.he main function of a cell membrane is to regulate what enters and exits the cell. The cell membrane also gives a loose shape to the cell and ensures that parts of the cell do not flow away from the cell. The cell membrane consists of a thin layer of amphipathic phospholipids.