Las medusas forman parte de los grupos de animales más antiguos de la Tierra: ¡ya existían antes que los dinosaurios! Las medusas flotan en el océano desde hace unos 650 millones de años. Su cuerpo es blando y acampanado, con tentáculos que pican (de cuatro a un centenar) y cuatro largos brazos orales con una boca en el centro.
OBSERVACIONES
Las medusas están hechas principalmente de agua ...
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