1.) como se llaman
2.) como te llamas tu
Well you should put spanish as your race and brazil as your home country
As the text is not added to the question, I will provide some ideas for you to write the corresponding paragraph.
As regards similarities, it might be said that both countries have a great influence on food for many different countries such as China, Japan, Mexico.
they concentrate most of their population in the big cities (New York/ Buenos Aires)
They have great Universities and postgraduates course in many different fields of study.
In connection with differences, it might be said that in the US the official language is English while in Argentina the official language is Spanish (Castellano).
While in the US people is used to eat big breakfasts, in Argentina people have "mate" coffee or tea with something to eat.
In the US people go to sleep quite early in Argentina people go to bed very late at night (23.00 or 00.00, maybe later) every day.
