Answer:
Air inside the guard hairs traps heat close to the body, keeping the reindeer warm even in the frigid, windy temperatures of the tundra. The guard hairs also prevent body heat from escaping and melting the snow if the reindeer lies down, keeping it from getting wet and cold.
The material that are used by biotechnologists would be C. Restriction endomuclease. These are specialized group of enzymes that can cleave or break multiple phosphodiester bonds between DNA sequences.
Not having enough energy within the cells, injury and/death could occur.
