Animals whose cells are arranged in the embryo layer between the outer and internal membrane, are called _________________________
Diaploblastic Beast
The translated stem means: animals whose body cells are arranged in two embryonic germ layers — an outer layer and an inner layer — are called ______.
Diploblastic animals have only two germ layers: the outer ectoderm and the inner endoderm, with a non-cellular mesoglea between them. Examples are cnidarians such as Hydra, jellyfish and sea anemones.
Triploblastic animals have a third germ layer, the mesoderm, between the ectoderm and endoderm (flatworms to chordates), so they do not fit a two-layer description.
"Symmetrical animals" refers to body symmetry, not to germ layers, and "monoblastic" is not a standard grouping of animals.
Hence, such animals are called diploblastic (written Diaploblastic Beast).
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