Which of the following best describes cnidarians?

Which of the following best describes cnidarians?

Cnidarians are aquatic animals belonging to the phylum of Cnidaria. These organisms may be found in marine or freshwater environments, and include the sea jellies (or jellyfish), sea anemones, and siphonophores.

Which of the following is a characteristic associated only with cnidarians?

Which of the following is a characteristic associated only with cnidarians? cnidocytes specialized for defense and capturing prey.

What does the mouth of the cnidarian open into?

Anthozoa is the largest cnidarian group, with over 6000 species. Anthozoans are always marine polyps, with no medusa in the life cycle. The polyps can be solitary or colonial, and tend to be large. The mouth opens into a flattened invagination known as the pharynx, which in turn opens into the gastrovascular cavity.

Do cnidarians have a digestive system?

Cnidarians possess a well-formed digestive system and carry out extracellular digestion. The cnidocyte is a specialized cell for delivering toxins to prey and predators.

Which describe cnidarians they are?

Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).

How does digestion in cnidarians differ from digestion in sponges?

Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

Do cnidarians have a complete digestive system?

Cnidarians have an incomplete digestive system with only one opening; the gastrovascular cavity serves as both a mouth and an anus.

What cnidarian body form is sessile?

polyp
polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface).

What is the difference between Porifera and cnidaria?

Porifera are aquatic organisms known as sponges, while cnidarians are for example jellyfishes, corrals, etc. Poriferans are the most simple multicellular animal organisms. They are always sessile while cnidarians may be sessile (the corrals) or free living (jellyfishes).