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The nematodes ( / ˈnɛmətoʊdz / NEM-ə-tohdz or NEEM-; Greek: Νηματώδη; Latin: Nematoda ), roundworms or eelworms constitute the phylum Nematoda. [3] [4] They are a diverse animal phylum inhabiting a broad range of environments. Most species are free-living, feeding on microorganisms, but there are many that are parasitic. [3]
Reflex. In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action [1] and nearly instantaneous response to a stimulus. [2] [3] The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.