And then in later experiments, we found the opposite, that fir was sending more carbon to birch than birch was sending to fir, and this was because the fir was still growing while the birch was leafless.
Em experimentos posteriores,  encontramos o inverso: o abeto enviando mais carbono à bétula do que a bétula ao abeto. Isso porque o abeto ainda crescia,  enquanto a bétula não tinha folhas.