Because there are different environments; humans have adapted to their environment as they spread across the world. For example, melanin in the skin acts as a shield against ultraviolet light, however if it completed blocked ultraviolet, vitamin D would not be generated in the body. In tropical areas, the sun is very strong and people have more melanin, in cooler areas the sun is less strong and people have less melanin so sufficient vitamin D is generated.
Scientists say that modern humans evolved in Africa, so that the very first people were African. They had very dark skin, suited to full-body exposure to the hot sun. Light coloured skin would burn too easily in this environment.
When humans migrated to Europe, with its weak sun, they also had to cover up most of their bodies in order to keep warm. Not only was it no longer necessary to have dark skin in order to prevent sunburn, people with such dark skin suffered from vitamin D deficiency, since this requires absorbsion of ultraviolet radiation. An evolutionary change was to develop lighter skins, to allow more ultraviolet radiation absorption. Ideally, very fair skin and blond or red hair predominated in the far north of Europe, with slightly darker skin and hair in the south. The cold air also caused them to develop longer noses, with narrower nostrils, in order to warm the air before it reached their lungs. These changes were really very minor and were not made consciously, but they did help offspring who inherited these traits to survive in the colder climate. Similar changes resulted in the lighter skinned Asian people.
Within continental groups, localised changes occurred among peoples who became relatively isolated from others, either because of physical barriers or religious and cultural constraints. However, over the last few thousand years, there have been several great migrations, both within continents and across continents, which have created a much more complex mixture of ethnic groups.
They come from all over the world with different races, background, nationalities, ethnicity, languages, and different Islamic sects.
The Filipino population is a blend of various races and cultures due to centuries of colonization and trade. This includes influences from indigenous groups, Spanish colonization, Chinese traders, and American occupation. As a result, Filipinos have a diverse mix of Malay, Chinese, Spanish, and American heritage, creating a unique cultural identity.
Yes, different races can MARRY.
There are not different human races, there is only one.
There are many different races in Canada.
because it wouldn't be write to not have black people and just have white ect it is just not cool
There are many different races that are held besides foot races. These races include bike races, swimming races, and competence races.
If you want biblical explanations, the bible does have one for the existence of different languages, which is the story of the Tower of Babel. As for different races, presumably different children of Adam and Eve gave rise to different races (some theologians prefer to trace back the different races to the different children of Noah). But bear in mind that the bible is a form of mythology, which should not be taken literally.
Some races that come to the Philippines are the Indonesians, Malays, Japanese, Spaniards and the Americans.
It is an activity where people from different countries come together to compete in different competitions and races to win glory for their country
US settlers have come from all different places (European countries mostly in the earlier days). Such as French, English, Dutch, Swedish, Portugeese and Spanish. Although now we come from all different races of people.
i really have no idea...maybe their saying that if different animals can have sexual intercourse, so can different races of people