Select all that apply. Characteristics of most vertebrates' body structures include _____. 1) bilateral symmetry 2) four levels of cell organization (cells, tissues, organs, organ systems) 3) pseudocoelomates 4) coelomates 5) acoelomates 6) asymmetry 7) radial symmetry
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Bilaterally-symmetrical animals are called triploblasts, developing three tissue layers: an inner layer (endoderm), an outer layer (ectoderm), and a middle layer (mesoderm).
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middle layer
an inner layer
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