Answer the following question given this paragraph: 

Leaves are the keys not only to plant life but to virtually all life on land. The primary role of leaves is to collect sunlight and make food by photosynthesis. Leaves vary in size, shape, and how they are arranged on stems. You can see examples of different types of leaves in Figure below .


Q: Which is the process through which leaves collect sunlight and make food?


A:
photosynthesis