1. Explain why a snake would not be considered an insect.
2. Why does the existence of an exoskeleton put an upper limit on the size of an arthropod?
3. In the context of evolution and fitness, why does reproductive isolation due to species recognition develop and spread?
4. For groups that share unusual structures or characteristics, such as highly specialized limbs for prey capture or venom production, how can you tell if these structures are homologous or analogous?