PL P! Stomata are sometimes closed. For instance, plants may close their stomata during hot, dry days. Why do you think they do this.

The stomata enable carbon dioxide gas to enter the plant for photosynthesis . Oxygen and water vapor exit the leaves through stomata, as well. In many plants, when the outside temperature is warm and water evaporates more readily, plants close their stomata to prevent excessive water loss.

in addition to being able to metabolize, grow, digest food, and excrete wastes, what other functions must an organism perform if it is to survive? survival also depends on the ability to maintain one's boundaries, to move, to respond to stimuli, and to reproduce. oxygen is a survival need.