Blood gets its color from hemoglobin ... This might indicate liver problems or certain types of anemia. In extremely rare cases, blood can look greenish. This weird phenomenon has been reported ...

Like your eye and hair color, you inherit your blood type from your parents. Each parent passes down one allele (a version of ...

O positive is the most common, but O negative is the most safely donated; it can be given to anybody irrespective of the recipient’s blood type, so it is valuable in emergencies. Types of blood ...