Bioluminescence<span> I think thats what it says in my book</span>
A. <span>A flatworm doesn't have a coelom
Flatworms and other invertebrates belong to a specific group called </span><span>acoelomate, wherein they lack a coelom and has an internal cavity which serves as their digestive cavity.</span>
They lose water by evaporation on their skin and respiratory surfaces
