- A butterfly is a kind of insect
- Metamorphosis is when an insect changes from an immature form to an adult form
- Therefore, metamorphosis is when a butterfly changes from an immature form to an adult form

- The immature form of a butterfly is called a caterpillar
- The adult form of a caterpillar is called a butterfly
- Hence, the adult form of a caterpillar is a butterfly and the immature form of a butterfly is a caterpillar

- Metamorphosis is when a butterfly changes from an immature form to an adult form
- The adult form of a caterpillar is a butterfly and the immature form of a butterfly is a caterpillar
- Hence, metamorphosis is when a butterfly changes from caterpillar to a butterfly

Therefore, metamorphosis is when a butterfly changes from caterpillar to a butterfly
Q: During which process does a caterpillar become a butterfly?
Context:
- The immature form of a butterfly is called a caterpillar 
- A butterfly is a kind of insect 
- Metamorphosis is when an insect changes from an immature form to an adult form 
- The adult form of a caterpillar is called a butterfly