Kingdom Animalia is the biggest in terms of number of organisms. The animal kingdom is the most extensive kingdom with over 1 million known species. Thus, option "C' is correct.
The class contains one or more related classes. All the types of a phylum possess some commonly correlated factors.
So the class shield the most considerable numbers of organism.
Thus, option "C' is correct, The animal kingdom is the most extensive kingdom with over 1 million known species.
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