On which continent did the first upright primates (hominids) appear?

Answer: Africa.
It is believed that the most advanced primates, the hominids, appeared about five million years ago. Perhaps the climate change on the continent has led to the fact that there are many open areas of space devoid of trees. Therefore, the ancestors of monkeys and humans were forced to descend from the trees and master these spaces. Walking on two legs gave them a great advantage – the body did not overheat so much in the sun, there was a better view, the use of the upper limbs for making the simplest tools.