The diagram below shows the structure of an animal cell. which number label represents cytoplasm?

Number 4 is the cytoplasm.

Explanation:

The cytoplasm houses the cytoplasmic organelles and some substances contained therein, usually temporarily, such as proteins, lipids and pigments. In the space between these substances and the organelles, it is possible to observe the cytoplasmic matrix, also called cytosol, which is a substance of varying consistency. Thus, the cytoplasm is composed of all intracellular organelles and cytosol.

As you can see in the picture above, all organelles are inserted into structure number 4. For this reason, we can say that number 4 represents the cytoplasm.