Question

Why is cytochrome-C evidence for a shared common ancestor among all eukaryotes?

Only prokaryotes produce cytochrome-C, not eukaryotes.
Cytochrome-C has changed significantly from organism to organism.
The enzyme isn't necessary for survival but is found everywhere.
It's an enzyme necessary for survival in all eukaryotic organisms.

Answer 1

Answer: it's an enzyme necessary for survival in all eukaryotic organisms.

Explanation: i took the test and got it right !

Answer 2

It’s an enzyme necessary for survival in all eukaryotic organisms.