The characteristics of medusae are sessile, have tentacles, mouths open downward. The correct option is A.
What is a medusae?
Medusae is a body type which is present in the species of phylum coelenterates.
These are typically jellyfishes, the medusa part of the body is bell shaped and have tentacles.
Thus, the correct option is A, are sessile, have tentacles, mouths open downward.
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