Answer :

Decomposition in our daily life is a very important reaction in our life because if the daily food material which are wasted ,if it is remained without decomposition reaction it may start to spoil and give a bad smell and the spoilt food will become a poison .So , decomposition reaction is a must.
Decomposition is very important for our daily lives as the process rotting takes place because of decomposition. The bacteria acts on the waste foods or vegetable peals and etc adds up a good nutrients to the soil. And a good manure too.