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Here's an interactive exercise about the needs of all living things. The introduction explains that scientists can use the knowledge of life requirements to guide their search for life on Mars. Players identify which of these six items are necessary for life: sunlight, oxygen, water, meat, energy, and raw materials. If any wrong answers are given, players are shown the number of correct answers and are given access to Learn More buttons. All the Learn More sections are similar. In them, players adjust the amount of the given item (e.g., sunlight) to determine, based on creatures' responses, if the item is needed for life. A plant, a human, and two microbes are shown. When correct answers are submitted, a congratulatory screen appears offering additional links to explore. Copyright 2005 Eisenhower National Clearinghouse
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