Compared to smaller animals, bigger species require less food (carbon) per day to support each gram of tissue.
与较小动物相比，较大物种每天支持每克身体组织所需的食物(碳)量更少。
2
Plant productivity is a measure of the rate of the photosynthesis process that green plants use to convert solar energy, carbon dioxide and water to sugar, oxygen and eventually plant tissue.