Bees are invertebrates. Invertebrates are animals that do not have a backbone, and this group includes insects, arachnids, mollusks, and many more.
Bees belong to the class Insecta, which makes them part of a larger family of invertebrates known as arthropods. Arthropods are characterized by their segmented bodies, exoskeletons made of chitin, and jointed legs. Unlike vertebrates, which have a internal skeleton and a backbone, invertebrates like bees rely on their exoskeleton for support and protection.
Therefore, when considering the classification of bees, they absolutely fall into the category of invertebrates due to their lack of a vertebral column or backbone.