Question

When Robert's great-grandfather was a detective many decades ago, he frequently

used the A-B-O system to help solve crimes. How did he MOST likely do this?

Answer 1

Robert's great-grandfather most likely help solved crimes by: using blood samples.

What is the A-B-O system?

The A-B-O system can be defined as a system that is used to classify the human blood into different types, especially based on the absence or presence of certain biological materials (markers) on the surface of red blood cells.

Types of human blood.

In Science, there are four (4) main types of blood types and these include:

1. A
2. B
3. O
4. AB

In conclusion, we can deduce that Robert's great-grandfather help solved crimes by using blood samples in accordance with the A-B-O system.

Read more on blood samples here: https://brainly.com/question/9041908