The life cycle of a butterfly is egg first. They stay in the egg for a week or so. They stay in the larva for two weeks. They will stay in the pupa for one or two weeks. When it comes out it is an adult.
The thorax and antennae are attached on to the head. The head is stock on to the thorax. Legs are stuck on to the thorax. They also have an abdomen .That is a butterfly body part.