The key pigment in this process is chlorophyll, so plants are mostly green, with perhaps a touch of colour to their flowers and their fruits.
(The key pigment in this process; is; chlorophyll) (plants; are; mostly green, with perhaps a touch of colour to their flowers and their fruits)
The key pigment in this process plants
is are
chlorophyll
mostly green, with perhaps a touch of colour to their flowers and their fruits