what does the steady development of tools in the hunter-gatherer societies suggest about early human's intelligence?

The north had all of the following advantages over the south, excepta expansive industry to maintain their economyb. a large number of educated professional officers and soldiersc. a strong central governmentd. control over the major trade routes select the best answer from the choices provided

Doctors recommend that both men and women take an aspirin every day to prevent heart attacks. however, the sample in the research study only contained men. the problem with doctors making this aspirin recommendation reflects a bias.

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.