Answer:
Centrosome
Step-by-step explanation:
Diagram I and are II are single cells. Diagram I is an animal cell, Diagram II is a plant cell (can see the cell wall and the central vacuole).
G is the centrosome. The centrosome is made up of two cylindrical structures called centrioles. They are the microtubule organising centres (MTOCs) in cells. They regulate the assembly of microtubules during the cell cycle