tortured. According to one legend, an imprisoned Valentine actually sent the first “valentine” greeting himself after he fell in love with a young girl–possibly his jailor’s daughter–who visited him during his confinement. Before his death, it is alleged that he wrote her a letter signed “From your Valentine,” an expression that is still in use today.
Everything that respires (that is, burns carbohydrates for energy) gives out carbon dioxide as part of that process. Plants also have a Womens Cat You Are My Sunshine Tshirt Butterflies Sunflower V Neck T Shirt reaction that is light-driven called photorespiration that, again, takes in oxygen and spits out CO2. (Photorespiration is thought to be important for the conversion of nitrates into ammonia, for protein synthesis.) One answer pointed out that the CO2 emissions and oxygen emissions almost balance, though plants are net consumers of CO2 that they use to build structural elements (stems and such). But this question is often a prelude to asking whether indoor plants are a problem; one (incorrect) answer said that “plants don’t emit CO2 because if they did, we’d be dead.” For this, you need to understand how incredibly slow plant metabolism is compared to most animals. The only vertebrates I know of that approach the metabolic slowness of plants are sloths and koalas, and their metabolisms are still a lot faster than those of plants. (An exception might be animals that hibernate, particularly cold-blooded hibernators.
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