The ______ (i) _____ vary in colour from olive green to various shades of brown depending upon the amount of_____ (ii) _____

• A

  (i) red algae (ii) phycobilins

• B

  (i) green algae (ii) chlorophyll

• C

  (i) brown algae (ii) chlorophyll

• D

  (i) brown algae (ii) carotenoids