Which of the following substances do animal cells contain? chitin cartilage cellulose collagen

Collagen  is a substance contained by animal cells.

Explanation:

An exclusive substance of animal cell, the collagen is constructed by amino acids like- Proline, glycine, arginine etc. It is present in the connective tissues and flesh of animals. It can be locate in the skin tissue that is connective and gives it elasticity and renews it constantly.

It has major portion of body proteins in it and it helps in strengthening the structure of body and skin. It can also be seen in the tissues of muscle, in the vessels of blood, kidney etc. It keeps the tissues and cells bound together.

the answer is c.) there is a warm front in region a and a stationary front in region b.

thinking it would be physical characteristics