In the hierarchy of classification, which grouping will have the smallest number of organisms with maximum common characteristics and which will have the largest number of organisms?

Monera has the smallest number of organisms with maximum common characteristics in the hierarchy of classification.
Monera was first proposed as a phylum by Ernst Haeckel in 1866. There are approximately 10,000 species of Monera on Earth.

Animalia has the largest number of organisms in the hierarchy of classification.
There are approximately 9 million species of Animalia on Earth.