Figure 43.3 Use the Graph in Figure 43.3 and the Information Provided

Figure 43.3
Use the graph in Figure 43.3 and the information provided in the paragraph below to answer the following questions.
Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph in Figure 43.3 shows the mean (peak) dates of bird arrival, bird hatching, and caterpillar season for the years 1980 and 2000.
-Your friend is wary of environmentalists' claims that climate change could lead to major biological change on Earth. Which of the following statements should you use to support the biological predictions associated with climate change?

A) We know that atmospheric carbon dioxide has increased over the past 150 years.
B) Through measurements and observations, we know that CO₂ levels and temperature fluctuations are directly correlated, even in prehistoric times.
C) Hundreds of organisms have already shifted in distribution as a result of warming that has occurred over the last 100 years.
D) Sea levels will likely fall, displacing as much as 50% of the world's human population.