Stomata are pores in the leaves of plants that allow gases to enter and exit the cells. During the sunniest part of the day, the leaves are most actively performing photosynthesis.

During this time, which gas do the stomata allow into the leaf cells?

carbon dioxide

Explanation:

In most plants, the roots absorb water from the soil. The water travels up through the xylem, a specialized layer of cells. In some plants, the water is absorbed through the leaves, directly from the air. Carbon dioxide, an atmospheric gas, enters the leaf through the stomata, the tiny pores in the leaves (a stoma is a single pore).

i'd say that the moon rock is about 2.2 billion years old.