There are about 45.000 species of chordates, occupying marine, fresh and brackish water and terrestrial habitats.
There are about 45.000 species of chordates, occupying marine, fresh and brackish water and terrestrial habitats.
有大约45.000种脊索动物，它们占据着海、淡水或淡咸水和陆地的生态环境。