http://en.wikipedia.org/wiki/Anatomy
Animal Tissues.
The kingdom Animalia, also called Metazoa, contains multicellular organisms that are heterotrophic and motile(although some have secondarily adopted a sessile lifestyle). Most animals have bodies differentiated into separate tissues and these animals are also known as eumetazoans. They have an internal digestive chamber, with one or two openings; the gametes are produced in multicellular sex organs, and the zygotes include ablastula stage in their embryonic development. Metazoans do not include the sponges, which have undifferentiated cells.
Animal Tissues.
The kingdom Animalia, also called Metazoa, contains multicellular organisms that are heterotrophic and motile(although some have secondarily adopted a sessile lifestyle). Most animals have bodies differentiated into separate tissues and these animals are also known as eumetazoans. They have an internal digestive chamber, with one or two openings; the gametes are produced in multicellular sex organs, and the zygotes include ablastula stage in their embryonic development. Metazoans do not include the sponges, which have undifferentiated cells.
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