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ITBS Level 14 Grade 8 Science 2
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Avg score: 80% Most missed: “Which of the following phyla of animals do beetles belong to?”
Use your knowledge of science to answer questions below. A certain type of fast-breeding beetle has either large or small mandibles (jaws). The size of the mandibles is genetic. A student takes a randomly selected sample of beetles from the wild and feeds them exclusively on large, hard-shelled seeds. She records the number of large-mandibled and small-mandibled beetles each month, and gets the following data: Month: Number of large-mandibled beetles: Number of small-mandibled beetles: 1 40 60 2 42 55 3 43 52 4 48 50 5 55 48 6 56 51 7 ... Show more
ITBS Level 14 Grade 8 Science 2
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4 Questions

1. What are the beetles involved in the experiment an example of?
2. Which of the following best explains the data?
3. Which of the following phyla of animals do beetles belong to?
4. Based on these data, what kind of trait are large mandibles?