What is like the kidney of the earth?

Wetland is known as "kidney of the earth", and it ranks as one of the three major ecosystem types in the world along with forest and ocean. It is a unique ecosystem formed by the interaction between land and water, with seasonal or perennial water accumulation.

The basic characteristics of plants and animals that grow or inhabit wetlands are the most biodiversity-rich ecological landscape in nature and one of the most important living environments for human beings. ?

In a narrow sense, wetland refers to the area where the surface is too wet or often accumulates water, and the place where wetland creatures grow. Wetland ecosystem is a unified whole composed of wetland plants, animals, microorganisms and their environment.