Organized systems of agriculture, the maintenance of herds of domesticated animals, and permanent, year-round settlements marked a. paleolithic era c. bronze age b. stone age d. neolithic era

Option: d. neolithic era

Explanation:

It was during the Neolithic Era when people were beginning to practice farming. People for the first time were settling in one place rather than engaging in the lifestyle of hunting and gathering. Neolithic people built mud-brick houses, coated with plaster. People also engage in domesticating animals like goats, dogs, sheep, cows, and pigs.