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Refer to the information provided in Figure 31.1 below to answer the question(s) that follow. Figure 31.1
-Refer to Figure 31.1. Which of the following causes the ppf to shift from ppf2 to ppf3?
Kilocalories
A unit of energy measurement in food, commonly called a calorie, equal to 1,000 real calories or the energy needed to raise the temperature of 1 kilogram of water by 1°C.
Terrestrial Ecosystems
Ecosystems found on land as opposed to aquatic environments, characterized by the organisms that inhabit them and the environment they live in.
Aquifers
Underground layers of water-bearing permeable rock or materials through which groundwater can move and be stored.
Humid Climates
Climates characterized by high levels of humidity and precipitation, commonly found near the equator and in coastal regions.
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