The largest phylum in the animal kingdom is made up of what?

If by largest you mean greatest biomass then it would have to be the round worms phylum Nematoda

if you mean the greatest number of species then it would have to be anthropoda as it includes the insects.

If you mean by size then it would have to Chordata as it includes the whales. If by largest you mean greatest biomass then it would have to be the round worms phylum Nematoda

if you mean the greatest number of species then it would have to be anthropoda as it includes the insects.

If you mean by size then it would have to Chordata as it includes the whales.