锦秋御尚房价:¡¡translate!!
来源：百度文库 编辑：高考问答 时间：2024/05/19 22:30:27
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.