E. coli and elephants. What is meant by the phrase unity of biochemistry? What are the implications of the unity of biochemistry?

That all the living things share a common ancestor.

Explanation:

In this way all the living things on Earth we share a common ancestor, even nowadays we have different species as a result of the evolutionary process of millions of years.

But all the living things share similar biochemical molecules or processes, like for example, all of us we have DNA and RNA, even these molecules are similar, they are not the same.

Also we share a group of molecules like proteins and glycogen, even as the evolution produce different metabolic paths among the species.