What are some of the reasons scientists prior to the leakeys believed that humans originated in europe or asia?

The biggest reason why the scientists believed that the humans originated in Europe and Asia was that the remains of the early humans were only found in these two continents at that time.

Africa was largely unexplored, especially when it came to the early hominids, sot he scientists very theorizing on what they had available, ans that was fossils from Europe and Asia, as well as cave art from these two continents.

When the Leakeys made the discovery of the Australopithecus, everything changed, and the theories about the human origin made a sudden twist.

It has to be taken in consideration though, that with the modern day technology, it turned out that the Australopithecus is not really possessing the right features to be classified as hominid, so it is becoming very debatable about the human origins again.

la segunda guerra mundial comenzó el 1 de septiembre de 1939 y terminó el 2 de septiembre de 1945. ¡espero que esto ayude!

biological/genetic factors means they were born or predisposed to have something. nothing can really change it, and you can't really do much to "fix" it. it isn't something learned

these are the biological factors:

adrian is relatively tall and he is on the basketball team

(adrian can't ever stop being tall or force himself to be tall. likely one or both of his parents are tall as well and they passed on the tall gene. he probably does basketball because he is tall)

the rest are environmental/cultural factors. these are things that are taught to us. for example, cynthia wasn't born saving pocket money, her family most likely taught her this (environmental factor)

hope this !