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[tex]\sf \blue{d. \: all \: of \: the \: above}[/tex]
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If the Earth does not tilt, the Sun will always appear directly above the Equator, the amount of light received by a received location will be fixed, and there will be no seasons. Nor will it be necessary to mark the equinoxes or solstices.
[tex]\tt \colorbox{lavender}{-G} \tt \colorbox{pink}{i} \tt \colorbox{plum}{u} \tt \colorbox{orchid}{l} \tt \colorbox{hotpink}{a}[/tex]