1) Based on the graph, what is the most likely explanation for the seasonal rise and fall of carbon dioxide (CO₂) levels in the atmosphere throughout the year? a) Increased fossil fuel use in summer months b) Global deforestation trends c) Photosynthesis rates changing with seasons d) Melting of polar ice caps during summer 2) Based on the graph, which of the following statements is best supported by the data? a) Voter turnout has steadily increased every election year since 2000. b) Voter turnout reached its lowest point in 2020. c) The 2020 election had the lowest voter turnout in the past two decades. d) Voter turnout has consistently remained below 60% since 2000. 3) A scientist wants to grow plants under conditions that maximize their growth. Based on the chart, which pH level should the scientist choose, and why? a) pH 4.0, because plant height increases at low acidity b) pH 7.0, because it resulted in the tallest average plants c) pH 9.0, because the plants are tolerant to alkaline environments d) pH 5.0, because it is a compromise between acidic and basic conditions 4) Based on the chart, which of the following conclusions is best supported by the data? a) The U.S. economy relies primarily on industrial production b) A majority of U.S. workers are employed by the government c) Agriculture remains a key source of employment in the U.S. d) Most American workers are employed in the service sector

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