Identify parts 3 and 4 Two functions of layer 1 identify gas X and Y ? ?

Parts 3 and 4 are not specified in the question.

Two functions of layer 1 in networking are:
1. Physical transmission of data
2. Encoding and decoding of data signals

Gas X and Y are not specified in the question, so it is not possible to identify them.

Part 3

Two functions of layer 1 are:

- To absorb sound energy. Layer 1 is made of a porous material that absorbs sound waves, reducing the amount of sound that travels through the wall.
- To provide thermal insulation. Layer 1 is also made of a material that resists heat flow, keeping the interior of the building cooler in the summer and warmer in the winter.

Part 4

Gas X: Nitrogen (N2)
Gas Y: Oxygen (O2)