The oxygen production per plant should differ as an augmentation to O2 production. also for trees the benefit of seed enhancement should affect be a speed bonus / seed bonus AND and an o2 production bonus as another goal to work towards such as with achiving highest nutritional value with eadible plants. so maybe low nutritional value veggies give low o2 / medium veggies / medium o2 and trees = high o2. right now there is no point to growing tree besides being able to say that one has done it.
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