Because that was the time when nazi powers were rising in power. At the time he was only there as a traveler but then he thought it would be better just to stay there. Hope this helped
It is a process<span> called termination.</span>
Remember that CO2, light and heat (to activate the reaction and keep the enzymes happy) are all needed for a reaction. When one goes missing, it destroys the whole process.
1. No light = no reaction can be made. That means the plant wouldn't intake any CO2 anyway.
2. When very hot the enzymes will denature (plant dead) or when cold, the activation energy will not be there. So once again, it will not respond to light as it is not its primary concern.
