Final answer:
Three infraorders of primates are Simiiformes, Tarsiiformes, and Cercopithecoidea, with each encompassing various families and species of primates that have adapted to different environments and lifestyles.
Step-by-step explanation:
Three Infraorders of Primates
The Order Primates is categorically split into several infraorders, but three notable ones include Simiiformes, Tarsiiformes, and Cercopithecoidea. The Simiiformes infraorder is further divided into Platyrrhini, the New World monkeys of Central and South America, and Catarrhini, which are Old World monkeys found throughout Africa and Asia. Tarsiiformes are represented by tarsiers, which exhibit a mix of prosimian and simian features. Lastly, the Cercopithecoidea includes Old World monkeys like baboons, mandrills, and macaques. These infraorders encompass the significant diversity of primates, which vary in brain size, nocturnality, and physical adaptations such as the prehensile tails seen in many New World monkeys.