IN CLASS:; "WHAT COLOUR IS THE SKY?"; IN EXAM:; "COMMONLY REFERRED TO AS THE SKY, THE LAYER OF THE ATMOSPHERE THAT WE PERCEIVE FRAGMENTS THE LIGHT PIGMENTATION AS IT ENTERS THE EARTH'S ATMOSPHERE. MOST HUMANS HAVE THREE LIGHT-DETECTING, SENSITIVE "CONES" (RED, GREEN AND BLUE) IN THEIR RETINAS. WHAT IS THE WORD THAT CATEGORISES THE PIGMENTATION THAT IS AGREED UPON, BY SCIENTISTS AND CITIZENS ALIKE, TO BE THE CORRECT PIGMENTATION OF THIS REFRACTED LIGHT THAT MOST HUMANS PERCIEVE?"
