Here's why:

* Cytoplasm is the gel-like substance that fills the space between the cell membrane and the nucleus. It's composed mainly of water, but also contains dissolved nutrients, salts, and proteins.

* Organelles are the functional units within the cell, like mitochondria, ribosomes, and the Golgi apparatus. They are suspended within the cytoplasm.

* Biochemical reactions occur constantly in the cytoplasm, facilitated by enzymes and other molecules dissolved within it.

Therefore, cytoplasm serves as both the suspension medium for organelles and the site of numerous biochemical reactions.