Which Was Probably Not a Step in the Evolution from Single-Celled

Multiple Choice

Which was probably not a step in the evolution from single-celled to multicellular organisms?

A) The specialization of cells within a cluster of cells
B) The collecting of several cells into a cluster
C) The organization of specialized cells into groups
D) The rise of intercellular communication within a cluster of cells
E) The rise of intracellular signal transduction pathways