Ans. In insects and frogs, hormones play a crucial role in completing their life cycle. In insects, a hormone called ecdysone triggers molting, where the insect sheds its exoskeleton and grows a new one. In frogs, hormones such as thyroxine and prolactin regulate the metamorphosis process, transforming the tadpole into an adult frog. These hormones control the growth and development of various organs and tissues, allowing the insect and frog to complete their life history and transition from one stage to another.