If you think if the tube-within-a-tube body plan as a pipe with a straw inside, where would you expect to find most of the ectodermal, mesodermal, & endodermal germ layers, respectively?

If you think if the tube-within-a-tube body plan as a pipe with a straw inside, where would you expect to find most of the ectodermal, mesodermal, & endodermal germ layers, respectively?



Answer: pipe; space between pipe & straw; straw.