Since plants shed their leaves and don't perform photosynthesis during winters, where does oxygen come from?
closed as off-topic by anongoodnurse, another 'Homo sapien', theforestecologist♦, Satwik Pasani, March Ho May 15 '17 at 2:30
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – anongoodnurse, another 'Homo sapien', theforestecologist, Satwik Pasani, March Ho