1. Correct answer is C. An organism with several different organ systems.
2. Correct answer is C. The earth's atmosphere, lithosphere, hydrosphere, and cryosphere are all referred to as the geosphere or biosphere. The area above the Earth's surface is known as the atmosphere.
3. Correct answer is E. The ability of an organism to keep the body's internal environment within bounds that enable it to survive is referred to as homeostasis.
4. Correct answer is B (evolution). The horse progressively gained larger body size (perhaps to better protect against predators), taller-crowned teeth to handle abrasive grasses, and long, monodactyl limbs to run away from predators in their increasingly open habitat. This is how the famous account of horse evolution came to be.
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