How come everybody doesn't have the same blood type?

Subject: How come everybody doesn't have the same blood type?

Date: Sat Oct 21 16:26:56 2000
Posted by Diana
Grade level: 10-12 School: CND
City: TMR State/Province: Qc Country: Canada
Area of science: General Biology
ID: 972160016.Gb

Message:


I know that there are different blood types caused by antigenes, but why 
doesn't everyone have the same blood type? At the very beggining, what 
created different blood types? How come each animal has a different blood 
type? It it because some viruses occur only in some blood types and not 
others? Please help me

Re: How come everybody doesn't have the same blood type?

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