Final answer:
Cultural differences are prevalent, but all cultures have common elements known as cultural universals. These include patterns or traits that are globally common to all societies, such as the family structure and customs like funeral rites and weddings.
Step-by-step explanation:
Despite how much humans have in common, cultural differences are far more prevalent than cultural universals. For example, while all cultures have language, analysis of particular language structures and conversational etiquette reveal tremendous differences. In some Middle Eastern cultures, it is common to stand close to others in conversation. North Americans keep more distance and maintain a large "personal space." Even something as simple as eating and drinking varies greatly from culture to culture. If your professor comes into an early morning class holding a mug of liquid, what do you assume she is drinking? In the United States, it's most likely filled with coffee, not Earl Grey tea, a favorite in England, or Yak Butter tea, a staple in Tibet.
Although cultures vary, they also share common elements. Cultural universals are patterns or traits that are globally common to all societies. One example of a cultural universal is the family unit: every human society recognizes a family structure that regulates sexual reproduction and the care of children. Even so, how that family unit is defined and how it functions vary. In many Asian cultures, for example, family members from all generations commonly live together in one household. Other cultural universals include customs like funeral rites, weddings, and celebrations of births. However, each culture may view and conduct the ceremonies quite differently.