Final answer:
The specialized cell responsible for delivering toxic stings to other organisms is the stinging cell or cnidocyte found in animals from the phylum Cnidaria.
Step-by-step explanation:
The specialized cell that is responsible for delivering toxic stings to other organisms is called a stinging cell.
In animals from the phylum Cnidaria, such as jellyfish, corals, and sea anemones, these cells are known as cnidocytes. Cnidocytes contain large organelles called nematocysts that store a coiled thread, barb, and toxin. When the hairlike projection on the cell surface, called a cnidocil, is touched, the thread, barb, and toxin are fired from the nematocyst.