For Each of the Structures Indicated on the Diagram of a Cross

Short Answer

For each of the structures indicated on the diagram of a cross section of a plant leaf (below),indicate the function from the following list,for which it is most likely an adaptation to life on land.

A)absorption of CO₂
B)retention of water
C)evaporation of water
D)collection of light
E)release of CO₂
1)Structure X
2)Structure Y
3)Structure Z