Many plants and animals have different forms, sometimes radically different forms, at various stages of their life cycles.
Why do tadpoles become frogs?
What the hell is human adolescence all about? (My own adolescence was especially rough.)
Animals that must pause to shed their exoskeletons in order to grow larger can do some major internal remodeling in the down time. Some insects, like cockroaches, look pretty much the same at different stages of their lives. Some, like ladybugs and butterflies do not.
wikipedia
There are no "gotcha!" questions challenging the theory of evolution, no more that there are "gotcha!" questions challenging the theory of gravity. One might as well argue that the earth is flat. The butterfly question is one I've heard from creationists, and this makes me a little wary of discussions like this.
As Theodosius Dobzhansky said, "Nothing in Biology Makes Sense Except in the Light of Evolution."
I'm an evolutionary biologist by natural inclination and some formal training. I'm much more comfortable living in an immense constantly evolving universe than I would be living in some madhouse created a few thousand years ago by a cruel and capricious god.
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