In general, yes, the dorsal blood vessel of a worm be seen from the worm's exterior because a worm's "skin" is very thin. Although of course there are exceptions.
Energy from ATP causes a transport protein to change shape, binding substances on one <span>side of the membrane, and releasing them on the other.</span>
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy!
Electron pairs , because the atoms become stable by gaining the electron pairs
