In geology, a graded bed is one characterized by a systematic change in grain or clast size from one side of the bed to the other. Most commonly this takes the form of normal grading, with coarser sediments at the base, which grade upward into progressively finer onesI just learned about this in our rocks and minerals unit for science,
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Its C hope this helps! if its wrong let me know
The answer is
B. Beak shape
This is because in various areas the beaks were different shapes
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I believe they go: response bias goes with "answer that have been unfairly influenced'
question wording bias goes with "using words in a survey....." and under coverage goes with "not getting complete....."
