【正确答案】 D

【答案解析】原文：American scientists say they have developed a way to grow wood material in a laboratory. The method could create different wood products indoors in a single process, greatly cutting the cost of production and reducing damage to the world’ s forests. Researchers from the Massachusetts Institute of Technology demonstrated a proof of concept by growing wood-like structures from cells taken from the leaves of a flowering plant. The results were recently reported in a study appearing in the Journal of Cleaner Production.题目问的是为什么磷对生命的形成至关重要。根据新闻可知，磷是形成生命的重要元素，它能帮助形成细胞结构并支持DNA。故答案为D。