Here's why:

* Ribosomes are the sites of protein synthesis: They translate genetic information from messenger RNA (mRNA) into protein molecules.

* More ribosomes mean more protein production: A cell with many ribosomes can produce proteins at a much faster rate than a cell with fewer ribosomes.

Therefore, cells that have a high demand for protein production, such as:

* Muscle cells: For building and repairing muscle tissue.

* Pancreatic cells: For producing insulin and other enzymes.

* Antibody-producing cells: For creating immune defenses.

...are likely to have numerous ribosomes.