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Brain is the ability to sense and to react or we can say it is the rellay center between action and its reaction although every organism show some stimulations known as taxis but those which have well defined brain or nervous system are called CHORDATES, Well those organism which do not have brain comes under nonchordates although there is one more category which is known has hemichordates : they have under develop nervous system

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Q: What is the name of the organism that does not have brain?
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Is a brain cell a organism?

No. A brain cell is just one cell in a many-celled organism.


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ne helpful organism is the brain. The brain controls your body to do what, and when. a helpful organism is a centipede it feeds on nematodes and aphids which are enemies to farmers


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