What does bd and gd stand for. gang related

Is there such a thing as a social structure that constrains individual action, or is society nothing more than a figment of our imaginations?

What impact did improvements in farming technology near the end of the nineteenth century have on the american economy? a. more energy was needed to power equipment, creating the renewable energy industry. b. less labor was necessary on farms, leading workers to pursue other jobs. c. less money was invested in farming as many locally owned farms went bankrupt. d. more demand for agricultural products reduced the price of food and animal products.

Lava and other matierls luanced from a volcano and into the air are referenced as