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A Phylogenetic Tree Phylogenetic Tree A color is a body cavity lined with mesoderm surrounding the digestive organ or system. The term acoelomate means that the organism doesn t have a body cavity and the mesoderm is packed inbetween the ectoderm and the endoderm. Pseudocoelomates have a body cavity that is incompletely lined with mesoderm so their organs lie loose. In protostomes, the mouth develops near the blastopore first, and then the anus forms. In deuterostomes however, the anus develops near the blastopore and the mouth forms second. Cleavage is the first event in development.
In protostomes, spiral cleavage occurs, and daughter cells sit in grooves formed by previous cleavages. The fate of these cells is fixed in protostomes, which means each can contribute to development in only one way. In deuterostoms, radial cleavage occurs, and daughter cells sit on top of the previous cells. The fate of these cells is indeterminate, which means that if they are seperated from each other, then each cell can go on to become a complete organism. Radial symmetry means that if you cut along the center anywhere on the organism, the organism will be similar on both sides.
Bilateral symmetry means that you can only cut down the length of the organism and have the two halves be similar. A phylogenetic tree is a diagram that indicates common ancestors and lines of descent, and embryonic development. Classification of animals is based on type of symmetry, number of tissue layers, type of color, and presence of segmentation. The bottom half of the phylogenetic tree contains organisms that lack a true color such as the primera, criteria, platyhelminth es. The rotifer a and nematode are pseudocoelomates which are right above the acoelomates. Everything above are cellmates, wich are either protostomes or deuterostomes.
This allow seperation of echinoderm ata and chordata, which are deutrostomes, and arthropods, mollusca, and annelid, which are protostomes.
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Research essay sample on Daughter Cells Body Cavity
