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Using examples of invertebrate nervous systems how can the process of evolutionary cephalization be described?
Considering the instance of invertebrates it is observed that evolution makes the enhancing of the complexity of the organisms to be accompanied by convergence of nervous cells to special structures for controlling and commanding: the ganglia and the brain. In easy invertebrates, like cnidarians, the nervous cells are not concentrated but they are found dispersed in the body. In platyhelminthes a starting of cephalization with the anterior ganglion concentrating neurons is already verified. In annelids and arthropods the existence of a cerebral ganglion is evident. In cephalopod molluscs the cephalization is even big and the brain commands the nervous system.
You have an extensive library of genomic DNA fragments, prepared by the use of restriction nucleases. You know their sequences and sizes and you have an assay to reliably separate
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what are the excretory organs of birds
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What are ions? What are the two types of molecules into which ions are classified? Ions are atoms or substances electrically charged by means of loss or gain of electrons.
1. Northern blotting The quantity of rna species can be quantified by calculating the quantity of rna through northern blotting which provide size and sequence information
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Oxides of nitrogen: These include nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO is a colourless, odourless and inert gas but like CO it can also combine with
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