The fuzzy coat of carbohydrates on the outer surface of the plasma membrane that functions in cell identification is called the

Glycolipid and glycoprotein.

Explanation:

The plasma membrane consists of the bilayer lipids and the proteins. Carbohydrates are present in the plasma membrane in association with lipids and proteins.

The carbohydrates that are associated with lipids known as glycolipid and the association of the carbohydrates with protein is known as glycoprotein. These helps in the cell identification and the also helps in the cell communication and cell cell signalling.

Thus, the correct answer is glycolipid and glycoprotein.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint