John spent his days planting ficus trees. He did so because trees were an important part of what?\nOptions:\n- tropical rainforest\n- ecosphere\n- sunny window\n- pots\n- dirt Let's think step by step:
User
Trees are crucial part of our ecosphere for survive of humans and other live habitats on earth. Planting trees is required to maintain the balance in ecosphere. So, the answer is ecosphere.
Assistant