Vacuoles: Structure, Function, and Role in Cells

The correct answer is vacuole. Vacuoles are large cavities or sacs that are found in plant cells, protozoans, and some other organisms. They are enclosed by a membrane and can contain air, partially digested food, water, or other materials. In plants, vacuoles help to maintain the cell's shape and turgor, and they also play a role in storage and transport of materials. In protozoans, vacuoles can help with digestion, excretion, and osmoregulation.