Trace historic reasons for the increase in global populations by selecting all correct answers.

a. Around 8,000 BC people learned to farm and raise animals.

b. In the 15th century, plants from the Americas were taken to Europe to provide new foods.

c. In the 16th century, inventions such as tractors made farming easier.

d. Life expectancy increased with treatment for diseases.

e. Medicines became available around the time of Columbus.

Around 8,000 BC people learned to farm and raise animals.

In the 15th century, plants from the Americas were taken to Europe to provide new foods.

Life expectancy increased with treatment for diseases.

Explanation:

Neolithic revolution is a term referred to the change when the humans first engaged in agriculture lifestyle with hunting and gathering. The domestication of the plants and animals restricted the movement of human and this sedentary lifestyle directly resulted in population rise.

Moreover New World commodities including sugar, potatoes, tobacco, and chocolate introduced to the old world. The starchy food production of potato and sugar supplemented the growth of production in the fifteenth century.

And the treatment of diseases using modern science and technology have increased the life expectancy significantly.