Asmall branch of the optic nerve, known as the path extends directly from the retina to the scn.

Answer;

Retinohypothalamic path

A small branch of the optic nerve, known as the retinohypothalamic path extends directly from the retina to the SCN.

Explanation;

The SCN is an abbreviations for suprachiasmatic nucleus or nuclei; which is a region in the hypothalamus. that is responsible for controlling circadian rhythms.

Retinohypothalamic path is a neural input pathway that extends directly from the retina to the SCN.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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b. read the phase at the intersection of any given temperature and pressure.