Which of the following occurred when the climate warmed about 12,000 to 10,000 years ago?

a. the environment became more diverse.

b. paleo-indians began to rely more on hunting.

c. the number of mammoths and other large mammals increased.

d. ocean levels dropped to new levels.

The correct answer is A) The environment became more diverse.

What occurred when the climate warmed about 12,000 to 10,000 years ago was that the environment became more diverse.

This helped Paleo Indians in that they had more diversity of plants, fruits, and animals they could hunt for survival. According to historians, Paleo Indians were the first humans that ing¿habited the North American territory. They were animal hunters that followed animal herds from Asia and during the last ice age could cross to America through a frozen bridge that connected Asia to America: the Bering Strait. This strait separates Russia from Alaska by 58 miles.

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.