Irritability in Coelenterata Infographic Diagram example hydra emergence of first simplest form of nervous system parts structure nerve cell net sensation movement biology science education vector premium vector by udaix

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vector illustration life animal form first skin structure biological cell net part drawing education movement biology science system Arc tissue chart layer reflex scheme diagram transmission emergence example neuron nervous impulse sensory sensation response stimulus nerve receptor stimulation Hydra ectoderm irritability stimuli phylum coelenterata infographic simplest epithelial endoderm mesoglea cindoblast

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