Which of the following combinations of phylum and description is correct? (A) Echinodermata—radial symmetry as a larva, coelom (B) Nematoda—roundworms, internal skeleton (C) Platyhelminthes—flatworms, gastrovascular cavity, no body cavity (D) Porifera—gastrovascular cavity, coelom

Video transcript

Welcome back. Let's look at our next question. Which of the following combinations of a phylum and its description is incorrect. So let's go through our answers looking knowing that we're looking for the incorrect pairing of Philemon description. Choice A says phylum, Nigeria diplo plastic and radial symmetry. While the Nigeria are include things like jellyfish and sea anemones. They are diplo plastic. And just a quick review as we might recall from our content videos, diplo plastic. And then we see another answer. Triple A plastic for to that stage in the earliest development. Um as the embryo begins to differentiate into layers, they can be deployed plastic organisms which only split into two layers in that early development. Um The inner and outer end of term or external and internal end as opposed to triple A. Plastic organisms which developed three layers the endowed ERM ERM and measure. So that distinguishes different species. How many layers they develop. And we can look at that word plastic and think of the blast early on in development. To help us remember. So the Nigerians are diplo plastic only two layers in the early embryo and they show radio symmetry symmetry around a central axis like a starfish or many flowers. So that cannot be our answer. Since that is the correct pairing. In this case. Choice B says phylum plate helmets. Triple plastic and a C limits well, the plotting helmets are included. The flatworms. They are triple plastic and early development and they are a celebrates the Salem is the central body cavity in an organism. And these flatworms. My guess from their name Flat do not have Asylum. So this is the correct pairing of phylum and characteristics. Here next we have choice C. Phylum peripheral asymmetrical and sponges seal while the peripheral peripheral are the sponges and they are asymmetrical and they have a sponge of seal. Sponges seal being a large central cavity in a sponge. So again correct pairing. So not our answer. Well we are left with choice D. It says phylum nematode to triple plastic vertebrates while nematodes are roundworms. They are triple plastic and early development but they are not vertebrates. They are invertebrates. So Choice D. As we might predict is the correct is the incorrect pairing of phylum and description. So Choice D. Phylum nematode, A triple plastic vertebrates is the incorrect pairing and therefore our answer. See you in the next video