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BIO


An acoclomate is a lower invertebrate animal. It does not develop a body cavity. A protostome is a member of one or two distinct evolutionary lines of coeleomates, consisting of annelids, mollusks, and arthropods, and characterized by spiral, determinate cleavage, schizocoelous formation of the coelom, and development of the mouth from the blastopore. In deuterostomes is a member of one or two distinct evolutionary lines of coeleomates, consisting of echinoderms and chordates. The newly formed cells of the early embryo come to lie directly above the cells underneath. This is known as radial cleavage. The anus is developed from the blastophore and the is enterocoelous formation.Bilateral body plan has only one plane of symmetry. This symmetry pretty much divides the body into right and left sides equally. It is like cutting right down the center. In radial symmetry, the body is disk-like or cylindrical, perhaps with radiating arms. Many equal parts radiate outward like the spokes of a wheel. It is cooler than bilateral symmetry in my opinion. Phylogeny is the evolutionary history of a species or group of related species. All of these pairs show evolution in affect. Phylogeny was changed with these. Each of the different terms are advancements or previous versions of another. Evolution is in progress. 3.As we survey the living members of the plant kingdom there is a tendency to think in terms of primitive and advanced groups and that one group represents the ancestor of another: a moss evolved into a fern which evolved into a conifer and so on until we reach the flowering plants. However the plants we see today are all descendants of fossil plants. If we wanted to see which plants were the ancestors of conifers and flowering plants we would have to go back in time to see the plants which were the common ancestors of both groups. The evolutionary origins of plants can go back 430 million years.


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