Pearson eText Essential Cosmic Perspective, The --Instant Access (Pearson+)
Pearson eText Essential Cosmic Perspective, The --Instant Access (Pearson+)
9th Edition
ISBN: 9780135794982
Author: Jeffrey Bennett, Megan Donahue
Publisher: PEARSON+
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Chapter 15, Problem 39EAP

Galactic Ecosystem. We have likened the star−gas−star cycle in our Milky Way to the ecosystem that sustains life on Earth. Here on our planet, water molecules cycle from the sea to the sky to the ground and back to the sea. Our bodies convert atmospheric oxy-gen molecules into carbon dioxide, and plants convert carbon dioxide back into oxygen molecules. How are the cycles of mat-ter on Earth similar to the cycles of matter in the galaxy? How do they differ? Do you think the term ecosystem is appropriate in discussions of the galaxy?

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