I must be really slow.. I still don't get it...
1.Hmm what do you mean by "partakes in every part of the food chain is incredibly intelligent design"?
Does that mean that it eats many different things? In that case what is so special about that? Humans eat loads of different things, I guess humans are very special as well but what is so special about the frog?
2. Wasn't the explanation supposed to say something about the why of the different stages? If not the explanation from evolutionists would be: Evolution did it. That was an easy one in that case..