Final answer:
Cnidocytes are significant to fundamental processes for cnidarians. They contain nematocysts, which are used to capture and immobilize prey or repel predators.
Step-by-step explanation:
Cnidocytes are significant to fundamental processes for cnidarians. These specialized cells contain organelles called nematocysts, which are used for capturing prey and repelling predators. When the cnidocils on the cell surface are touched, the nematocysts release coiled threads with barbs and toxins, either entangling the prey or penetrating its flesh, immobilizing or paralyzing it.