Analyze and Conclude
1. Calculate Suppose there are 1000 units of
energy available at the producer level of the
energy pyramid. Approximately how many units of energy are available to the third-level consumer?
66 Chapter 3 • Lesson 3

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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