9. How is Earth different from all the other planets? A. It rotates on its axis. B. It has a breathable atmosphere. C. It has a rocky surface. D. It is warmed by the sun.

One of the standout features of Earth is its breathable atmosphere, which is rich in oxygen and essential for life as we know it. While other planets may have atmospheres, none come close to providing the perfect mix of gases to support the diverse ecosystems that thrive here. Earth’s atmosphere also protects us from harmful solar radiation and helps regulate temperature—what a cozy planetary home! Additionally, Earth is unique because it's the only known planet with liquid water on its surface, covering about 71% of the planet. This presence of water is crucial for sustaining life and supports everything from the tiniest microorganisms to the largest mammals. So, the next time you take a sip of water, remember that it’s a rare treasure in our cosmic neighborhood!