Why must the origin of Eukaryotes have happened after the origin of aerobic metabolism?

1. Why must the origin of Eukaryotes have happened after the origin of aerobic metabolism? 

2. Why must the origin of the Archaeplastid chloroplast have happened after the origin of eukaryotic cells? 

3. Why must the origin of the Stramenopilean chloroplast have happened after the origin of chloroplasts in the Archaeplastida?