This is possible. Namely, the o<span>ptic nerve transmits visual information from eyes to the brain. But, in some situations, the optic nerve may be damaged. So, eyes are completely normal regarding their structure and function, but the optic nerve cannot transmit information to the brain. Since brain does not receive any information from the eyes, the person is considered blind.</span>
Answer:
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Explanation:
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Every seventh time a rat presses a lever, it receives food pallets.
