The broadest level of organization in the modern classification system

Domain.

Explanation:

THe broadest level of organization in the modern classification system is the Domain, this is the largest division on living beings, and it depends on the kind of cell that the living beings have, and it is divided in three doamins, Eukarya, Bacteria, and Archae, this depends on the similarities and differences between the cells of the beings that belong in every different domain. The next level of organization after domain is Kingdoms.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

the answer is cell division : )