the one with the most organism is domain
The kingdom level of classification contains the most diversity and number of organisms. It is the broadest level where organisms are grouped based on shared characteristics.
The highest level, called Domain, contains all of the other levels, and thus by default, contains the most organisms (all of them).
Bacteria
Most plants and animals live in the Sunlit Zone.
The genus Arthropoda(mosquitoes, flies, grasshoppers etc.) contains most organisms if u r concerned about animal kingdom
Leaching Zone
The most specific is genus
The bottom of the pyramid contains the most energy.
Organisms within the same family are more closely related than those within the same order. Family is a higher classification level than order, so organisms within the same family share more recent common ancestry.
The category that most similiar organisms belong to is genus.
species
The most inclusive level of life is the domain, which includes all living organisms on Earth. This level encompasses all organisms and includes the highest level of classification in the Linnaean taxonomy system.