(1)生命的物质基础 The Physical Bases of Life Tree of Life-What is life built of? 生命之树是用什么建造的？ 生命由地球元素组成：Life is made of elements on Earth The 1648 potted willow experiment of Johannes Baptista van Helmont1 Tree of Life-What is life built of？ 生命之树是用什么建造的？ The 1648 potted willow experiment of Johannes Baptista van Helmont （1）生命的物质基础 The Physical Bases of Life 生命由地球元素组成：Life is made of elements on Earth