杭州交通信息网花瓶柱栏杆图片:¡¡translate!!
来源：百度文库 编辑：杭州交通信息网 时间：2024/04/29 20:50:59
The producers vary greatly in size, but a single grass, plant or alga,for example ,is given the same status as a single tree.This explains why is a true pyramid shape is often not obtained. Also parasitic food chains may give inverted pyramid of numbers.