Answer:
The correct answer is d. phylum.
Biological classification is the process by which different organisms are classified and grouped on the basis of different properties such as complexity of cells, mode nutrition, mode of reproduction etc.
There are mainly 7 taxa in which scientist group different organisms. In hierarchical order these taxa are:
Kingdom
Phylum
Class
Order
Family
Genus
Species
Species is the smallest or the basic unit of this classification. It has the maximum similarity among its members.
As we go up from species to kingdom, the level of similarities decreases and the size of the group increases.
So, among the options provided, phylum would be the most inclusive, largest and least specific.
