Which statement(s) about cnidarians is/are true?

A) Reproduction is both sexual and asexual.
B) Some forms are sessile and others are motile.
C) They live in either marine or freshwater environments.
D) They have specialized stinging cells that contain a toxin-filled capsule.
E) All of the answer choices describe characteristics of cnidarians.

Cnidarians

A phylum of aquatic invertebrate animals that includes jellyfish, corals, sea anemones, and hydras, characterized by a simple body structure with a single opening and tentacles with stinging cells.

Stinging Cells

are specialized cells found in various marine organisms such as jellyfish and corals, used for capturing prey and defense by discharging toxic substances.

Toxin-Filled Capsule

A structure containing poisonous substances, often produced by microorganisms as a defense mechanism or to attack other cells.