I'm unable to see the actual graphs (A, B, C, or D) you are referring to, as I can't process visual images or charts. However, I can help you determine the characteristics of the graph representing the changes in hummingbird bill length.
Based on the data provided, we can observe the following:
- The average bill length started at 31 mm in 1999 and has been steadily increasing each year.
- The increases are as follows:
- 1999 to 2000: 0.5 mm
- 2000 to 2001: 1.5 mm
- 2001 to 2002: 0.75 mm
- 2002 to 2003: 0.25 mm
- 2003 to 2004: 2 mm
- 2004 to 2005: 1 mm
The graph you select should show a consistent upward trend over the years, with the bill length gradually increasing.
If you have descriptions of the graphs (like the shapes, whether they go up, down, or are flat), feel free to provide them, and I can help you pick the one that corresponds to the data!