Final answer:
Prosimians are nocturnal, smaller in size, and have smaller brains compared to anthropoids.
Step-by-step explanation:
Prosimians and anthropoids are two groups within the order Primates. Prosimians include bush babies, lemurs, pottos, and tarsiers, while anthropoids encompass monkeys, lesser apes, and great apes. The main differences between prosimians and anthropoids are that prosimians tend to be nocturnal, smaller in size, and have relatively smaller brains compared to anthropoids.