Middle School Life Science Quiz
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ECOSYSTEMS: INTERACTIONS, ENERGY, AND DYNAMICS
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A grassland ecosystem was observed for prairie dog population: Spring = 1,000, Summer = 980, Fall = 300, Winter = 290. Two explanations are offered:
Explanation 1: A prairie dog plague (bacterial disease) spread in late summer.
Explanation 2: Coyotes increased in number during fall and ate more prairie dogs.
Evidence: Trapping data show many prairie dogs had fleas (a known plague carrier) in late summer. Coyote track counts increased in fall, after the prairie dog population had already dropped. Explanations must be evaluated using evidence (fit and completeness). Which explanation is least supported by the evidence?
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