The answer would be D because the proportion is 6:9, which could be simplified to 2:3
The structure that forms cranial nerve I is the olfactory nerves while forming the 2nd is the optic nerve. Together with retina and olfactory epithelium, all of them are considered part of the Central Nervous System — wherein they synapse directly to the brain without the aid of any ganglia.
More than 4 million Americans take opioid prescription pain relievers for nonmedical uses. More than 400,000 Americans use heroin, a powerful opiate drug. Many people report misusing prescription opioids before starting to use heroin. Each year, more than 28,000 Americans die from opioid overdoses.
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