Inquiry Into Biology by McGraw-Hill Ryerson

By McGraw-Hill Ryerson

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Understanding food web interactions is important for predicting how biodiversity may increase or decrease in ecosystems, whether in the Arctic, the boreal forest, or the prairie grasslands. C, you will explore this idea further as you research the role that certain species play in the food web of an ecosystem that is unstable—an endangered grassland ecosystem. 2 Summary • A food chain is a model that shows the linear pathway through which food is transferred from producers to primary consumers and to progressively higher feeding levels.

Include the disadvantages or limitations of this approach. Chapter 1 Energy Transfer in the Biosphere • MHR 27 Connections Social and Environmental Contexts Biomagnification: A Fish Story Fish are an excellent source of energy and nutrients—in fact, they have been called the perfect food. In recent years, however, many scientists have reported finding toxic chemicals in fish. Methylmercury (a toxic form of mercury) is one such chemical. Chronic exposure to methylmercury damages the kidneys, liver, and nervous system.

For organisms that live in the deep ocean and (mainly) in other extreme environments, energy enters their part of the biosphere through the process of chemosynthesis. The energy-releasing process of cellular respiration and the energy-storing processes of photosynthesis (and chemosynthesis) are related to each other, providing organisms with the energy and matter they need to survive. Photosynthetic producers capture the • Sun’s energy and convert it to chemical energy in the form of high-energy carbohydrate molecules.

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