State two scientific discoveries during nineteenth century which contributed to food preservation

/in /by

State two scientific discoveries during nineteenth century which contributed to food preservation

You might also like
What factors led to the development of trade between North Africa and West Africa during the pre-colonial period?
Give one symbol of national unity in Kenya.
Explain the factors that undermine the activities of the movement since 1947.
Mention one main strategy introduced by Jomo Kenyatta to try and eliminate the social problems that faced Kenya at independence.
Name the European power that colonised the Democratic Republic of Congo.
Explain four rules to observe o’hen removing stains from a garment.
State three ways through which a person can become a member of parliament in Kenya
Give three reasons why Lenin introduced the New Economic policy in the Union of Soviet Socialist Republic USSR