Definition: Apoidea are small, primitive, or fossilized forms of life found in rocks. They include: - Dinosaurs: The first known fossils of animals that resemble dinosaurs, including the majority of them. - Bacteria: The microorganisms that make up our environment and have a wide range of functions. - Fungi: Tiny organisms with a unique ability to produce their own food. - Protists: Microscopic creatures without a backbone or cell walls.