Question 5. In humans, there are 3 alleles for blood type: A, B, O. A and B are co-dominant over O. A male with O type blood mates with a female with AB type blood.
The largest stadium in Spain is the Santiago Bernabaue in Madrid, it is Real Madrids stadium.
Estadio Azteca is overall the most historic stadium in Mexico City. It's an iconic soccer stadium and has played host to two World Cup finals. It was also the site for the largest boxing crowd in history when over 120,000 fans watched Julio Cesar Chavez pound Greg Haugen in 1993.