Question

Which are characteristics of medusae?

Answer 1

swim freely have tentacles and mouth opens downward

Step-by-step explanation:

I simplified the other dudes answer

Answer 2

Two body forms and two lifestyles are characteristic of the Cnidaria (see polyp and medusa). The sessile hydroid, or polyp, form is more or less cylindrical, attached to its substratum at its aboral (opposite the mouth) end, with the mouth and surrounding tentacles at the upper, oral, free end.