Is a tuna fish similar genetically to a mouse?


Jonathan, from Israel, asks: Is a tuna fish similar genetically to a mouse?

Natalia Diaz from AZTI answers: All living organisms share some basic genetic similarities due to the universal genetic code, like a language that all living things on  Earth use to carry instructions for making essential molecules for life.

Tuna and mice are like distant cousins which share a common ancestor. This common ancestral species, genetically evolved thorough millions
and millions of generations adapting to different environmental conditions.

As a result of this evolution, tuna fish have fins and gills, which help them breathe underwater and swim. Mice, on the other hand, have fur and tiny paws, and they breathe air through their noses, just like we do.