Nounphylum (plural phyla or phylums)
From Wiktionary under the GNU Free Documentation License. In biology, a phylum (plural: phyla) is a taxonomic rank below Kingdom and above Class. "Phylum" is equivalent to the botanical term division. Phylum is one of the major biological divisions called Taxa. Although "phylum" is often used as if it were a clearly defined term, no satisfactory definition of it exists. In fact, "phylum" may be a misnomer indicative of ignorance. Consequently the number of phyla varies from one author to the next. The relationships among phyla are becoming increasingly well known, and larger clades can be found to contain many of the phyla. From Wikipedia under the
GNU Free Documentation License What evolutionary advancements did the Phylum Porifera undergo? Q. Has the Phylum Porifera (sponges) made any evolutionary advancements? Asked by ali - Mon Jun 9 00:14:15 2008 - - 1 Answers - 0 Comments A. Sponges are one of the first multicellular orgasms. This is reflected in the fact that they are multicellular but they do not have an tissues. However, there is some argument over if they are truly the transition between single cell and multicellular organsims or if they are just a product of a symplification of a later organsism. Comb jelies (Ctenophora) may actually be this transitition organsim Answered by lod43 - Wed Jun 11 15:38:59 2008 Which one of the following statements about the phylum Echinodermata is false? Q. a. Many species possess an internal calcareous skeleton and spiny dermal projections. b. Larval forms show evidence of bilateral symmetry, which is mostly lost in the adult form. c. Echinoderms have true radial symmetry as adults. d. All possess a water vascular system, which permits movements via tube feet. e. One of the classes in this phylum is Asteroidea the sea stars. Asked by B - Wed Mar 11 17:37:56 2009 - - 1 Answers - 0 Comments A. The only fault I can find in all the statements above is in C. Echinoderms are radially symmetrical, but their symmetry is called pentaradial, not true radial. This is because it can be symmetrical when cut through in the middle of any one of it's FIVE feet. Answered by kookoo - Wed Mar 11 18:28:20 2009 What are the 5 classes within the phylum of vertebrates?
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