Because it killed hundred of thousands of people.
and the effect was continued to the next generation.
Many Japanese children were born with various genetical defects because of the nuclear explosion
hope this helps
The correct options are B AND D.
Agriculture was the major means of survival for men during the early days. Fluctuations in the rainfall during the course of a year may adversely affect the crops grown. If this persists for a long time it will leads to food shortage and famine.
Earthquake and eruption volcanoes are shift in the physical environment which can easily destroy any community.
The answer is D.the sever winters and large size of Russia
The factors are 2, 4, 5, 10 ,20, 25 ,50.