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Neuroglia are non-nervous cells present along with and in between the neurons in central nervous system, ganglia and retina. They have roles like myelin formation, transport of materials to neurons, maintenance of ionic balance and phagocytosis.

1. Neuroglia are non-nervous cells present along with neurons.
2. Neuroglia are found in the central nervous system, ganglia and retina.
3. Neuroglia help in myelin formation and transport of materials to neurons.
4. Neuroglia maintain ionic balance and perform phagocytosis.

Correct answer: Neuroglia are non-nervous cells present along with neurons.

Solution

The correct choice is the one that states the basic identity of neuroglia: they are non-nervous supporting cells associated with neurons. The other options mention location or functions, which are true but do not capture the main defining statement as directly.

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