ieiejwnwkwnwkwjejs ieiejwnwkwnwkwjejs
  • 04-04-2021
  • Biology
contestada

A. Bone

B. Organ systems

C. Organs

D. Specialized cells

A Bone B Organ systems C Organs D Specialized cells class=

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georgia64 georgia64
  • 04-04-2021
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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