Does Hydra have reflexes?

The structure of the hydra is very simple. But despite this, she has the ability to reflex. This does not require a complex nervous system. Even single-celled organisms perceive irritations. For example, they react to salt, heat, various mechanical damage, and so on. Hydra is more susceptible to stimuli than unicellular protists. Animals with a developed nervous system already have more complex reflexes. These are not only unconditioned reflexes, but also conditioned reflexes that appear with the acquisition of some experience.