Relating Concepts Nitrogen, water, phosphorus, and carbon are recycled and reused within an ecosystem, but energy is not. Explain why energy cannot be recycled.

Drawing Conclusions In the fall, many kinds of songbirds migrate from the United States to Central America or South America. Explain the benefits of migration for songbirds. What are some possible costs of this behavior?

26. Analyzing Concepts Ecologists have identified several characteristics that increase the likelihood that a species will become extinct. Specialization is one such characteristic. Explain why a very specialized species is likely to be more vulnerable to extinction.

27. Making Models Farmers often grow alfalfa, clover, or bean plants in fields after they have grown a grain crop. Explain this practice in terms of biochemistry.

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