Explain how photosynthesising cells obtain carbon dioxide

The air through leaves

Explanation:

Plants get carbon dioxide they need in order to not die off from air of leaves. It moves by diffusion through small holes in the underside of the leaf called stomata . ... These let carbon dioxide reach the other cells in the leaf, and also let the oxygen produced in photosynthesis leave the leaf easily.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.