http://en.wikipedia.org/wiki/Anatomy
Each typically has a cell membrane formed of phospholipids, cytoplasm and a nucleus. All of the different cells of an animal are derived from the embryonicgerm layers. Those simpler invertebrates which are formed from two germ layers of ectoderm and endoderm are called diploblastic and the more developed animals whose structures and organs are formed from three germ layers are called triploblastic.All of a triploblastic animal's tissues and organs are derived from the three germ layers of the embryo, the ectoderm,mesoderm and endoderm.
Each typically has a cell membrane formed of phospholipids, cytoplasm and a nucleus. All of the different cells of an animal are derived from the embryonicgerm layers. Those simpler invertebrates which are formed from two germ layers of ectoderm and endoderm are called diploblastic and the more developed animals whose structures and organs are formed from three germ layers are called triploblastic.All of a triploblastic animal's tissues and organs are derived from the three germ layers of the embryo, the ectoderm,mesoderm and endoderm.
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