Nematocysts in cnidarians are ____.

A) reproductive cells
B) excretory organs
C) sets of muscle cells
D) circulatory cells
E) defensive cells

Nematocysts

Specialized organelles within cnidocytes of cnidarians, such as jellyfish, used to capture prey through the release of a coiled, barbed thread.

Cnidarians

A phylum of aquatic invertebrate animals that includes organisms such as jellyfish, corals, and sea anemones, characterized by their cnidocytes, specialized cells used for capturing prey.

Defensive Cells

Cells within the immune system that are involved in protecting the body against both infectious disease and foreign invaders.