What is the evolutionary importance of the structure of a frog's neck?

Items evolve in nature toward adaption in an environment.

All Chordates are built on the same body design (animals with backbones/cartilage). We all have a head, a body, and four limbs, and a tail..... at least during the embryonic stage.

The length or lack of length of any structure...arm, leg, tail, neck..., isn't at all important in the general scheme of things. The neck of a frog is as long as it needs to be to allow the animal to thrive. Fish don't truly have a 'neck' either, nor do whales. The necks can be seen in the skeleton, but not in the fleshed out animals

You have missed the point in evolutionary development. Evolution wastes no efforts on structures not needed. A truly good example here is the cormorant of the Galapagos Islands.... they no longer can fly. (yet still have wings) And they lost that ability because there were no predators there. Their other cousins in South America remained able to fly. To keep huge chest flight muscles proved a waste, and thus they were less helpful in surviving in that environment. Instead what survived were birds that had developed larger webbed feet.

So, the frog has a "neck" in the skeleton, you just don't see it in the living animal. And since all of us in the Phylum Chordata are very closely related, look at the skeletons. Except for size, pretty much every bone you have, frogs do too. Pretty much every bone you have, a horse has as well.

If you are truly interested in how change evolves, read:

The Blind Watchmaker, by Richard Dawkins,

On the best seller list for years the year it came out, so popular it is in paperback, or get it at your library.... hugely, hugely interesting.

His discussion on the evolution of the eye is a true treat to read.... but get it only if you read at the sophomore hs level or better, and after you have taken a class in hs biology. Otherwise, it would be overwhelming, and read it later in your life.

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