1. Here is how to start. You have to show the derived characteristic for each phylum (red) on top of the branch. Next trait is cephalization and the next animal phylum is Platyhelmintes. Next complete digestive system phylum Nematoda. and so on. Use the traits (derived characteristics) that we covered in animal chapter to construct the rest of the tree. Symmetry cnidarian Eukaryotic multi cellular, heterotrophic Porifera 2. Explain the following characteristic in the nine-animal phylum. (true tissues, symmetry, type of digestive system, segmentation) Example: Phylum Porifera (sponge) true tissues (absent), symmetry (no symmetry or radial symmetry, type of digestive system (incomplete), segmentation (absent)

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Animal Diversity

Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.

Platyhelminthes

Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.