Suppose that the cells of seed plants, like the cells of human skin, produce a pigment upon increased exposure to ultraviolet radiation. Rank the following cells, from greatest to least, in terms of the likelihood of producing this pigment. Students also viewed
Population growth is the increase in the number of humans on Earth. For most of human history our population size was relatively stable. But with innovation and industrialization, energy, food, water, and medical care became more available and reliable. Consequently, global human population rapidly increased, and continues to do so, with dramatic impacts on global climate and ecosystems. We will need technological and social innovation to help us support the world’s population as we adapt to and mitigate climate and environmental changes. Human population growth impacts the Earth system in a variety of ways, including:
Can you think of additional cause and effect relationships between human population growth and other parts of the Earth system? Visit the burning of fossil fuels, agricultural activities, and urbanization pages to learn more about how processes and phenomena related to the size and distribution of human populations affect global climate and ecosystems. InvestigateLearn more in these real-world examples, and challenge yourself to construct a model that explains the Earth system relationships.
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