Answer:
one possible pattern that can be observed in wing length from 1973 to 1978 is that both shorter- and longer-winged finches decreased in number. Another possible pattern is that there are two distinct groups of birds with small and large wing lengths in both years. A third possible pattern is that some birds had longer wing lengths (up to 75 mm) in 1978 than in 1973 (up to 70 mm).
Step-by-step explanation: