I would say the answer is "D"
Hope this helps you!
The answer that you're seeking is, "Trains from different rail lines could use each other’s tracks." The standardization of rails allowed trains to use eachothers tracks and increase speed and efficieny in deliveries. Hope I helped!
Advances in medicine slowed death rates, and caused a population increase.
Answer:
<u><em>C. proximity</em></u>
Explanation:
The<u><em> Gestalt principle of proximity </em></u>states that objects and shapes form groups if they are close to one another. The shapes, sizes, and objects do not matter in this case even when there are visible differences. The law shows that smaller elements come together in a composition.
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