Which of the following animal groups does not have tissues derived from mesoderm? a. annelids b. echinoderms c. cnidarians d. flatworms
to answer this question, we first have to identify what the measured ERM is and then identify which, uh, animal will not have, uh, any tissue derived from messenger. So, based on our answer choices, we have to choose the correct answer choice that will not have any tissues derived from the messenger. So let's begin.