population
The order of the Monotremata contains the fewest species, with only five extant species. These species include the platypus and four species of echidnas.
Domain contains the fewest number of categories, with only three domains recognized in biological classification: Bacteria, Archaea, and Eukarya.
Species within the class Cephalaspidomorphi, which includes the lampreys, comprise the smallest number of species among vertebrates, with around 38 recognized species.
Biosphere contains the fewest number of species compared to community and population.
Population
Which contains the fewest data values
The y chromosome, which only contains a few hundred genes.
To determine which option contains the fewest number of years, you'll need to compare specific time frames or scenarios. For example, if comparing a 10-year span to a 5-year span, the 5-year span contains fewer years. If you provide specific options or contexts, I can help identify the one with the fewest years.
The group that contains the largest number of species is species.
Europe has the fewest number of amphibians.
Anarctica
Species. Explanation : Let us consider the next level of classification which is Genus. Genus is a group of closely related species. So, there are more number of organisms here as there are more than one specie. The next level is Family which is a group of closely related genera (Plural of genus). Now, here, there many genera which in turn contains many species. The levels of classification are such that each level contains more number of organisms than the previous level. So, it is called a Hierarchy of classification.