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| Description: Precise quantitative measurements are difficult About 1.75 million species identified; estimates of 3 to 10 million species, maybe 100 million Incomplete for several reasons Some areas of Earth little explored Many species are tiny and overlooked Many organisms are difficult to identify Latitudinal gradient = species richness increases towards the equator Plant productivity and climate stability play key roles Picture Stats: Views: 238 Filesize: 168.32kB Height: 795 Width: 1000 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35764 |