Ctenophores were formerly thought to be related to because of their gelatinous, medusa-like form.

Select all that applyWhy are ctenophores are no longer considered closely related to cnidarians?Multiple select question.They have a medusa-like form.They lack nematocysts.They have muscle cells derived from mesoderm.They are gelatinous.They are structurally complex.

Ctenophora have been shown to exhibit characteristics of triploblasts and they are a sister group to metazoans.Group startsTrue or False

What are characteristics of ctenophores?Multiple select question.Their life cycle is characterized by distinct polyp and medusa stages.Most species live in freshwater habitats.They possess colloblasts for prey capture.They move by coordinated beating of cilia.Many species are bioluminescent

Select the true statements concerning ctenophores.Check All That ApplyThey are diploblastic.They are diploblastic.They have some tissue derived from mesoderm.They have some tissue derived from mesoderm.They have a modified radial symmetry.They have a modified radial symmetry.They are a type of jellyfish.

In cnidarians, what is a medusa?Multiple choice question.A body form in which adjoined polyps create a colony that resembles a jellyfish (as in the Portuguese man-of-war)The tubular sessile form that has a mouth at the top that is surrounded by tentaclesThe free-swimming form that is umbrella-shaped with a mouth on the concave underside, surrounded by tentaclesA stinging cell that has a trigger and a nematocyst capsule with an inverted and barbed thread