All of these reasons are why it is so difficult to claim that chemical imbalances are the actual cause of anxiety, and not simply a symptom. Even if they are a cause, it appears that the ability to cope with anxiety can address some or all of the chemical problems.
The larger species of jellyfish eat crustaceans and other jellyfish. The tentacles are the main devices to catch prey for jellyfish. These tentacles have thousands of cnidocytes with stinging capsules or nematocysts containing venom.
Jellyfish and their relatives such as the Portuguese man-of-war are mobile, either actively swimming or pushed by winds and currents. Both stationary and mobile members of this group have radial symmetry with body parts radiating from a central axis. This allows jellyfish to detect and respond to food or danger from any direction. Jellyfish have an outer layer which covers the external body surface, and an inner layer which lines the gut.