<span>small, uncharged substance enter and leave the cell membrane through the process of : Simple diffusion
When a substance enter pass your cell membrane, it will filter up the uneeded substance to be excreted out from your body and letting the one that needed in by leveraging the thickness of the substances concentration</span>
The correct answer is that flatworms are similar to cnidarians in that both have true tissues.
Flatworms and cnidarians are not chordates as they are invertebrates. Only flatworms exhibit bilateral symmetry and only cnidarians lack a gastrovascular cavity. Both of which, though, have true tissues.