9. the model of hominid evolution suggests that the gradual evolution of homo erectus into modern human (homo sapiens) populations took place in different regions of the old world, not in one area of the world.
a. multiregional
b. replacement
c. “garden of eden” d. “eve hypothesis”

a. multiregional

Explanation:

There are several hypothesis about the evolution of modern humans, and one of those hypothesis is the multiregional hypothesis. This hypothesis states that the modern humans have evolved from Homo erectus and Neanderthals. The different races of humans though, according to this hypothesis, haven't all came from same Homo sapiens from Africa, but instead all modern humans have evolved in different regions, thus their different physical appearances.

The multiregional hypothesis divides the humans into four evolutionary regions, Africa, Asia, Europe, and Australia, thus having Africans, Asians, Europeans, and Australians.

The basis of this hypothesis are the differences in the appearance of the humans in different regions, the genetic differences, as well as the fossil records that show different patterns than what the ''Out of Africa'' hypothesis states.

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.