I have rewrote my essay again.please correct it.
Everywhere you go, everywhere you look, there is always somebody different. Differences in our society are often discussed. Many people do not socialize with those who have a different racial background than their own because of several reasone,sometimes it is racial prejudice the felling of superiority . Sometimes it is a feeling passed down in families and in cultures not examined. Sometimes this sense is involuntary and not from a known cause.

There are biologically fixed races; different races have different moral, intellectual, and physical characteristics. This is the ideal that many people engage in consciously and the way some people think without even realizing it.

The positive aspect of races socializing with other races is developing society by add new things like food and new ideas, it is found that the mixing of races produce more a healthy society because, “as everyone knows” that repeated mating within the same race leads to the emergence of diseases that appear in one race.For example Thalassemia, which it is an inherited disease.

In the same way,there is a nagetive aspects for this situation,It is sometimes lead to the racism which gives rise to increasing of crimes and destruction and disruption of community development.

I think it is important to study other cultures because later in life, you will be prepared to deal with people from other cultures in your jobb or in life.
Studying other world cultures will also teach you to become more tolerant and understanding of the different lifestyles, ideas, and behaviors of people. By studying other cultures, you will develop a well-rounded personality.

The continuance of living the different race in the same social tend to,after several generations, an homogeneous communities,and the sense of ethnicity will disappear because everyone will know that he came from the same (mixing) race. 
Program: Your essay is good and has improved a lot from the first draft..
Writing is hard work, it takes a lot of thinking and planning to write a good essay. I have made some suggestions.
program2I have rewrote my essay again.please correct it.
Everywhere you go, everywhere you look, there is you always can see somebody different. Cultural differences in our society are often discussed. Many people do not socialize with those who have a different racial background than their own because of several reasons; (a semicolon is needed because you are joining 2 main clauses with no conjunction) sometimes it is racial prejudice or a feeling of superiority . Sometimes it is a feeling passed down in families and in cultures which are not examined. Sometimes this sense is involuntary and not from a known cause.

There are biologically fixed races; different races have different morals, intellectual (I don't think that races have different intellects, they might have different belief systems, but even that is questionable. Perhaps you mean "customs"), and physical characteristics. This (? do you mean the customs and rituals?) is the ideal (ideals are held, not engaged in. People engage in activities such as ceremonies) that many people engage in consciously and the way some people think without even realizing it.

The positive aspect of races socializing with other races is developing a more holistic society by add new things like food and new ideas. It is found that the Mixing of races produces a more a healthy society because, “as everyone knows”, that repeated mating within the same race leads to the emergence of genetic diseases that appear in one race.For example Thalassemia, which it is an inherited disease

In the same way, there are negative aspects for this situation. Isolation of racial communities ,It is sometimes leads to the racism which gives rise to increasing of crimes and destruction and disruption of community development. (it also leads to ghettos, where the unemployment rates are high, housing is crowded and inadequate, the schools and medical facilities that are crowded and substandard, and lack of recreation areas like parks and playgrounds. This is what causes social malaise such as broken families, teenage pregnancies, drug addition, gangs and poverty. And that, in turn is what leads to crime and violence.)
I think it is important to study other cultures because later in life, you will be prepared to deal with people from other cultures in your jobb or in life.
Studying other world cultures will also teach you to become more tolerant and understanding of the different lifestyles, ideas, and behaviors of people. By studying other cultures, you will develop a well-rounded personality.

The continuance of living the different race living in the same social (? missing word) tend to, may after several generations, create a homogeneous community, and the sense of ethnicity will disappear because everyone will know that they come from the same (mixed) race.

Thank you so much AlpheccaStars for correct.
regards
M
Students: We have free audio pronunciation exercises.
Thank you so much AlpheccaStars for correctiton.
regards
M
Thank you so much AlpheccaStars for correctiton.
regards
M
Thank you so much AlpheccaStars for correctiton.
regards
M
Teachers: We supply a list of EFL job vacancies
Sorry,Correction.