Answer the following question given this paragraph: 

Chemical reactions that take place inside living things are called biochemical reactions . Living things depend on biochemical reactions for more than just energy. Every function and structure of a living organism depends on thousands of biochemical reactions taking place in each cell.


Q: What do you call chemical reactions that take place inside living things?

 Choices:

- contaminated reactions

- autonomous reactions

- physical reactions

- biochemical reactions

A:
biochemical reactions
