The Living World 8th Edition by George Johnson

تمرين 4

What feature appeared first in early human ancestors?
A) language
B) increased brain size
C) tool use
D) bipedalism
As early hominids evolved, drying and cooling of the climate caused expansion of African savannas. What evidence would you accept that this change favored upright walking? What are some of the advantages of bipedalism on the savanna?
Among what group of terrestrial animals has bipedalism not evolved?
A) reptiles
B) mammals
C) amphibians
D) birds