Select all of the characteristics of members of class Staurozoa. - A polyp that resembles a medusa, with...

Select all of the characteristics of members of class Staurozoa.
- A polyp that resembles a medusa, with eight arms surrounding the mouth
- A free-swimming planula larva
- Both polyp and medusa stages in the life cycle
- A solitary stalked polyp body form
- Polyps that reproduce strictly asexually
- An adhesive disc that attaches to objects on the ocean floor