In the new 6-kingdom system of classification, like the old 5-kingdom system, organisms are basically grouped by
a) cell structure.
b) location on earth.
c) reproductive methods.
d) unicellular versus multicellular.

The answer to the question stated above is letter A. Cell Structure.

In the new 6-kingdom system of classification, like the old 5-kingdom system, organisms are basically grouped by cell structure.

The new 6-kingdom system of classification includes the following:
Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria,  and Bacteria/Eubacteria.

Dna overload will occur