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A. Bone

B. Organ systems

C. Organs

D. Specialized cells

A Bone B Organ Systems C Organs D Specialized Cells class=

Sagot :

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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