Which animal phylum includes creatures such as jellyfish and corals?

The correct answer is B, Cnidaria, which is the phylum that encompasses a diverse group of animals including jellyfish, corals, and sea anemones. Cnidarians are characterized by their unique body plan, which typically includes a gelatinous, umbrella-shaped bell (as seen in jellyfish) and tentacles equipped with specialized cells called cnidocytes. These cells contain stinging structures known as nematocysts, which the organisms use for capturing prey and for defense.

Cnidarians can exist in two forms: the polyp form (like corals and sea anemones) which is typically sessile, and the medusa form (like jellyfish) which is usually free-swimming. Their body structure is essentially radial symmetry, which distinguishes them from other animal phyla that may have bilateral symmetry.

The other phyla listed do not include jellyfish or corals. Rotifera refers to a group of microscopic animals known as rotifers, which are typically found in freshwater environments. Mollusca encompasses a wide range of animals like snails, clams, and octopuses, characterized by their soft bodies and often a hard shell. Platyhelminthes includes flatworms, which are primarily paras