Around 200 thousand innocent people died. Around 100 thousand in each bombing. Japan also faced lots of money in property damage, as they had to rebuild. Finally they lost lots of military power.
When you say "diversity" I think of many things. So I have many answers:
1. People. Different people farming, means different plants and animals
2. Planting Crops. Planting different crops can prevent soil erosion and or soil exhaustion.
3. On the market. Different crops and meats on the market provides consumers with different products and nutrients they may need.
Idk if this helps, there wasn't much detail. Hope it helps! ;)
I would say 2 and 3. It seems to make sense
The answer is break-up of the German nation. C