to Ancient Rome. See how much you really know.
Ezoic
Your parents each pass down their blood type genes and the mix determines your type — so, a type O mum and a type B dad could have a type O or B child, whereas a type O mum and dad could only have a type O child.
Ezoic
What makes the four types different from each other is a molecule — known as an antigen — that attaches to the outside of your red blood cells.
“If you imagine a red cell
