- For each data category, the following bars are shown:
- Oulujärvi
- Mirror Lake
- Lake Neusiedl
- The data for the 2 categories are as follows:
- 1980–81:
- Oulujärvi: 194 days
- Mirror Lake: 122 days
- Lake Neusiedl: 77 days
- 2005–06:
- Oulujärvi: 155 days
- Mirror Lake: 119 days
- Lake Neusiedl: 104 days
- 1980–81:
It is common for freshwater lakes near or above a latitude of 45° north of the equator, like Lake Mjøsa in Norway, to accumulate surface ice in winter. The amount and duration of ice depends on many factors, including local weather conditions as well as the lake’s depth, volume, and surface area, but a climate researcher claims that some lakes in these latitudes have seen a decline in the duration of ice between the early 1980s and the mid-2000s. She cites as a typical example blank
Which choice most effectively uses data from the graph to complete the researcher’s example?