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notka56 [123]
3 years ago
13

A. Bone B. Organ systems C. Organs D. Specialized cells

Biology
1 answer:
Grace [21]3 years ago
7 0
Hydra has reached the tissue grade of organization, but it lacks organs. It consists of a tube about 5 mm long formed by two epithelial layers (endoderm and ectoderm). It has a head consisting of a mouth surrounded by a ring of tentacles at one end and an adherent disk, the foot, at the other end.
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