Question

Which are characteristics of medusae?

are sessile, have tentacles, mouths open downward
swim freely, lack tentacles, mouths open upward
swim freely, have tentacles, mouths open downward
are sessile, lack tentacles, mouths open upward

Answer 1

Answer:

In biology, a medusa (plural: medusae) is a form of cnidarian in which the body is shaped like an umbrella. The other mainbody-form is the polyp. Medusae vary from bell-shaped to the shape of a thin disk, scarcely convex above and only slightly concave below.