Gerak balas ini melindungi mata terutama pada retina dengan menghalang keamatan cahaya yang  berlebihan masuk ke dalam mata. Jelaskan mengapa semasa fenomena gerhana matahari

berlaku, kita perlu melihat kejadian tersebut pada permukaan air di dalam sebesen air.

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Increased profits reduced health risks

The answer is a. it makes more sense then the other answers listed there.

The "highest" point is a single point. 
there can't be more than one "highest" point.
it's not possible for every point on a line to be the "highest" one.

Each meridian forms half of a great circle, assuming a spherical earth. meridians intersect lines of latitude (parallels) at right angles. the spherical earth is divided into  360 degrees   east-west. lines of longitude range from 0° to  180° to the east and from 0° to -180 ° to the west of the prime meridian.