Polar bear
a thick layer of silicon looks great as clear cytoplasm
The ozone layer has a great deal of ozone. It is present as a layer in atmosphere as stratosphere.
protozoan
bark
If the ozone layer is damaged, UV rays will enter the earth. These will cause extinction of animal life.
The polar bear has black skin beneath its fur. The colour combination allows the animal to absorb heat from the sunlight to keep it warm. Polar bears have a thick layer of fat on their body. Fat being poor conductor of heat, they have minimal loss of heat from their body. They have very thick layer of fur, which again gives them the insulation needed there. Their colour is white to make them well-camouflaged in polar areas.
The thick layer of fat under a marine animal's skin is called blubber, and it keeps the animal warm, much like insulation in a house.
animal kingdom
The outside layer of the animal cell is the cell membrane.
polar bears and whales
Cell membrane
its is a cell wall