When studying a system, a conceptual model can help scientists understand O what components a system contains.
O how the system components affect each other.
O Both (a) and (b)
O None of the above
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How much of the united states female population works outside of the home? a. half b. two-thirds three-quarters d. one-third select the best answer from the choices provided.

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.

When employing the core learning system, reading text books and attending class are important ways to knowledge.