Differences In Animal Phyla Essay -- essays research papers

Because they are grouped in the same kingdom, the club animal phyla share the same fundamental characteristics- they are multicellular, heterotrophic eukaryotes that pose nutrients with ingestion, they privation cell walls, they have nervous tissue and vigor tissue, and they reproduce sexually and have a unique embryonic animation cycle. However, the animal phyla have a great number of differences as well. both(prenominal) are visible to the naked eye, while early(a)s are less obvious, and unperturbed more cannot even be seen after embryonic development. What are these differences, and how did they make up the development of the phylogenetic tree?In animals, the embryo becomes layered through the process of gastrulation, or the formation of the two layered, cup-shaped embryonic stage from a blastula. These layers are called germ layers. Most animals are triploblastic, meaning they have trinity germs layers. These are the ectoderm, the endoderm, and the mesoderm. The ectod erm is the outermost layers which forms the bodys covering and the primal nervous system. The endoderm is the innermost germ layer. It forms the digestive tube and gives nobble to most variety meat. The third layer, the mesoderm, exists between the endoderm and ectoderm. It forms the muscles and most other organs towards the upper layer of the animal. Diploblastic animals, or animals with only two germ layers, lack mesoderm. There are only two diploblastic phyla Porifera, the sponges, and Cnidaria, the bag animals. All other animals are ...