Ronaldinho is not playing in 2010 fifa world cup. He was not selected in the Brazilian Squad for the world cup.
Brazil
Because the people that make the selections decided so. Other opinions are irrelevant
Yes, Portugal qualified to play in the 2014 FIFA World Cup.
Oscar played for Brazil in the 2014 FIFA World Cup.
Marcelo played for Brazil in the 2014 FIFA World Cup.
Pepe played for Portugal in the 2014 FIFA World Cup.
No. Morocco did not qualify to play in the 2014 FIFA World Cup in Brazil.
Jefferson played for Brazil in the 2014 FIFA World Cup.
Fernandinho played for Brazil in the 2014 FIFA World Cup.
Paulinho played for Brazil in the 2014 FIFA World Cup.
Fred played for Brazil in the 2014 FIFA World Cup.