WebJul 18, 2006 · Your original three germ layers consisted of ectoderm, which developed into your epidermis and central nervous system; ... Ctenophora A problematic phylum—they resemble jellyfish, but also have ... WebANIMALS DIVERSITY ehb: animals animals can be characterized body plans animal species vary tremendously in morphology, but their great diversity in form can be

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WebStudents of comparative mentality unabashedly and ludicrously ask, "How far down the animal kingdom does learning extend?" Volume 1 of Hyman's celebrated treatise on the … WebCtenophora is a phylum of exclusively marine invertebrates. Ctenophora means “comb-bearing”. ... They are diploblastic, i.e. possess two embryonic layers, ectoderm and endoderm. Mesoglea is present between the ectoderm and endoderm, which is not well differentiated. ... The gastrodermis contains nutritive cells, germ cells and photocytes ... the prothonotary

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WebThe Ctenophora and Porifera are both considered to be basal because of the absence of Hox genes in this group, but how they are related to the “Parahoxozoa” (Placozoa + Eumetazoa) or to each other, continues to be a matter of debate. ... This germ layer gives rise to all specialized muscle tissues (including the cardiac tissues and muscles ... Webbody symmetry, germ layers, body cavities, skeletal sys-tems, and nervous systems that comprise these disparate metazoan body plans [3]. In approaching these questions, it is especially useful to consider the earliest-branching metazoan phyla – specifically, Porifera (sponges), Cteno-phora (ctenophores), Placozoa (Trichoplax), and Cnidaria WebThese three germ layers are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). In diploblastic organisms, such as Cnidaria and Ctenophora, the gastrula has only ectoderm and endoderm. The two layers are also sometimes referred to as the hypoblast and epiblast. the prothman company