Why is blood classified as class evidence and not individual evidence?

Explanation:

Blood type is considered to be class evidence. Although it may not specifically identify the suspect, explain how it still could be useful in helping to investigate a crime. used to rule out a certain suspect. Explain how the product rule can be used to determine whether two blood samples come from the same source.

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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i do not get it   at all