Which of these groups is the smallest level of classification

From largest to smallest, the seven classification are: 1.Kingdom

2.Phylum

3.Class

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4.Order

5.Family

6.Genus

7.Species

So species is the smallest  

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.