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Q. How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in platyhelminthes and nematodes?
Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain.
Nematodes have an anterior neural ring connected to two neural chords, a dorsal one and a ventral, while in planarias (platyhelminthes) there are only two small anterior "cerebral" ganglia from which neural chords split. Cephalization in annelids thus is more outstanding than in flatworms or in nematodes.
Q. Foods for Growth in microorganisms? Microorganisms differ in their ability to use various nitrogenous compounds as a source of nitrogen for growth. The primary nitrogen sour
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Why does oxygen concentration in the blood decrease during exercise? Why does carbon dioxide concentration in the blood change during exercise?
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