Part A: A - cell/plasma membrane. B - Nucleus C - mitochondrion
Part B: A - (cell membrane) regulates what enters and leaves the cell. B - (nucleus) controls cell activities or contains the genetic codes. C - (mitochondrion) respiration or energy release or production of ATP.
Part C: Photosynthesis Production of cellulose Produces chlorophyll Producing its own food
The organelle I have selected is the Cell Membrane!
Here is your second part:
Its function is to protect the interior of the cell by allowing certain substances into the cell, while keeping other substances out!
Here is your third part:
Well, in cell Y (plant cell) has a cell wall which protects the cell form any viruses that can harm the cell and in cell X (animal cell) doesn't have a cell wall!