How do annelids response to extertnal stmuli?

Answer 1

Annelids respond to external stimuli primarily through their nervous system, which includes a ventral nerve cord and segmental ganglia that coordinate reactions. They have sensory structures such as light-sensitive cells and chemoreceptors that help detect changes in their environment. When stimulated, annelids can exhibit behaviors like contraction, movement, or burrowing to escape threats or navigate toward food sources. Their responses are typically reflexive, allowing for quick reactions to stimuli.