Answer: d. The Rainforest is important to life as a whole to the planet
Explanation: option D best summarizes the information because the whole processes described are all essential in sustaining life as it is more encompassing that the other options. Plants therein sequestering carbondioxide and releasing oxygen is the process of photosynthesis, sugars are also produced which give life as food to a variety of animals. Plants and animals also avail themselves of the great quantities of water held by the plants. Thus the whole cycle produces more plants and animals to replace dying ones thereby preserving life.