The trapped sugar intensifies the color of the leaf when the shorter days cause the chlorophyll, the green pigment in leaves, to disappear.
(The trapped sugar; intensifies; the color of the leaf; T:when the shorter days cause the chlorophyll) (the shorter days; cause; the chlorophyll)
The trapped sugar the shorter days
intensifies cause
the color of the leaf T:when the shorter days cause the chlorophyll
the chlorophyll