Question

oxygen - generating cyanobacteria liberated enough o2 to open the door to reactions in metabolic pathways, leading to the evolution of cells.
reductive; archaean
oxidative; prokaryotic
reductive; eukaryotic
reductive; prokaryotic
oxidative; eukaryotic

Explanation:

Oxygen - generating cyanobacteria produced enough oxygen to enable oxidative metabolic reactions, which were crucial for the evolution of eukaryotic cells. Oxidative reactions require oxygen, and eukaryotic cells are more complex and evolved later in the history of life compared to prokaryotic and archaean cells.

Answer:

oxidative; eukaryotic