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Gas exchange in a leaf occurs through small regulated openings called:

ALumens
BStroma
CStomata
DGrana
Answer & Solution
Correct answer: C. Stomata
1. Carbon dioxide enters and oxygen leaves through them. 2. These openings are stomata. 3. Guard cells open and close them. _Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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