How is electricity generated in a nuclear power plant ?

Nuclear power is derived from energy that is released when relatively large atoms are split in a series of controlled nuclear reactions. The resulting heat is used to boil water which drives a steam turbine to generate electricity. The process of splitting an atom is known as nuclear fission

The breaking apart of glucose, which involves spontaneous reactions 

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.