The horizontal axis is labeled “Egg Incubation Temperature,…
The horizontal axis is labeled “Egg Incubation Temperature, in degrees Celsius,” and the numbers 20 and 40 are indicated. The vertical axis is labeled “Proportion of Hatchlings That Are Male,” and the numbers 0 through 1, in increments of 0 point 5, are indicated. The three curves are labeled “Green Turtles”, “Crocodilians”, and “Lizards”. The curve labeled “Green Turtles” begins at 20 degrees Celsius and 1 male hatchling. It moves slightly downward and to the right at first until it reaches approximately 27 degrees Celsius and 0 point 9 5 male hatchling. It then descends steeply until it reaches approximately 33 degrees and 0 point 0 5 male hatchling. At this point it moves slightly downward and to the right until it ends at approximately 40 degrees Celsius and 0 male hatchlings. The curve labeled “Lizards” begins at 20 degrees Celsius and 0 male hatchlings. It moves slightly upward and to the right at first until it reaches approximately 27 degrees Celsius and 0 point 0 5 male hatchling. It then rises steeply until it reaches approximately 33 degrees and 0 point 9 5 male hatchling. At this point it moves slightly upward and to the right until it ends at approximately 40 degrees Celsius and 1 male hatchling. The curve labeled “Crocodilians” begins at 20 degrees Celsius and 0 male hatchling. It moves horizontally to the right at first until it reaches approximately 23 degrees Celsius and 0 point 0 male hatchlings. It then curves steeply upward and to the right until it reaches approximately 30 degrees and 1 male hatchling. At his point it curves steeply downward and to the right until it reaches approximately 37 degrees Celsius and 1 male hatchling. It continues horizontally until it ends. The Green Turtles curve intersects the Lizards curve at 30 degrees Celsius and 0 point 5 male hatchling. The Crocodilians curve intersects the Green Turtles curve at approximately 27 degrees and 0 point 9 male hatchling, and it intersects the Lizards curve at approximately 37 degrees and 0 point 9 male hatchling. The graph above represents the proportions of hatchlings of certain types of reptiles that are male at different egg incubation temperatures. Which of the following claims is best supported by the data?