Final answer:
Proteins are essential for the movement of organelles within a cell and facilitate the uptake of materials like oxygen.
Step-by-step explanation:
The substance that is essential for the movement of organelles within a cell and facilitates the uptake of materials like oxygen is Proteins.
Proteins are involved in various cellular processes, including transportation. They act as transporters within the cell membrane, allowing materials to enter or exit the cell. Additionally, proteins known as motor proteins are responsible for the movement of organelles along microtubules within the cytoplasm.
For example, kinesins are motor proteins that transport vesicles containing substances like oxygen from one part of the cell to another.