OPT: 1). green leaves 2). nutrients 3). a healthy stem 4). hydration 5). looseness of soil 6). nearby mushrooms 7). aqueous solution 8). Organic compounds

Fact 1: The looseness of soil increases the amount of oxygen in that soil. Fact 2: Oxygen in the soil is vital for healthy roots. Given the two facts above, what is vital for healthy roots?
Answer:
5).