Numerical answer
Four of the five sentences below, when arranged in the right order, form a coherent paragraph. Identify the one sentence that does NOT fit and key in its number as your answer.
1. Migratory birds rely on a range of navigational cues, including the position of the sun, the pattern of stars, and the Earth's magnetic field, to travel thousands of kilometres between breeding and wintering grounds.
2. Some species appear to possess a light-sensitive protein in their eyes that may allow them to visually perceive magnetic field lines.
3. Experiments in which birds were placed in artificial magnetic fields confirmed that many species can reorient their flight direction based on magnetic cues alone.
4. Bird feathers are composed primarily of keratin, the same protein found in human hair and nails.
5. Researchers continue to debate exactly how these various navigational cues are integrated into a single, reliable sense of direction.
1. Migratory birds rely on a range of navigational cues, including the position of the sun, the pattern of stars, and the Earth's magnetic field, to travel thousands of kilometres between breeding and wintering grounds.
2. Some species appear to possess a light-sensitive protein in their eyes that may allow them to visually perceive magnetic field lines.
3. Experiments in which birds were placed in artificial magnetic fields confirmed that many species can reorient their flight direction based on magnetic cues alone.
4. Bird feathers are composed primarily of keratin, the same protein found in human hair and nails.
5. Researchers continue to debate exactly how these various navigational cues are integrated into a single, reliable sense of direction.
Show answer and solution
Answer: 4
Sentences 1, 2, 3 and 5 together discuss how migratory birds sense and use navigational cues, especially magnetic fields. Sentence 4, about the protein composition of feathers, is unrelated to navigation and disrupts the paragraph's coherence.
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