Final answer:
Animal cells do not have cell walls. Eukaryotic organisms like plants, fungi, and some protists have cell walls composed of materials such as cellulose or chitin.
Step-by-step explanation:
The cell wall is a structure found in various organisms, providing protection, structural support, and shape to the cell. It is present in plants, fungi, algae, some protists, and even in insects and mollusks as chitin. For example, plants have cell walls made primarily of cellulose, a polysaccharide composed of glucose units. This attribute lends the characteristic crunch when biting into raw vegetables like celery.
However, when addressing the question of whether Animalia have cell walls, the answer is no. Members of the animal kingdom do not have cell walls; instead, they are characterized by having a flexible plasma membrane. Cell walls in other eukaryotic organisms can be made of various materials, such as cellulose or chitin, which also forms the exoskeleton of insects and mollusks.