The text structure the author used in this paragraph is cause and effect. I know this because the author presents scenarios that lead to specific outcomes related to the visibility and survival of the rabbits in different environments.
For example, the author states, "Under these conditions, predators are less likely to see and catch the white rabbits." This illustrates the cause (the snowy field) leading to the effect (predators having difficulty seeing the white rabbits). The explanation reveals that the white rabbits benefit from their color blending into the environment, which enhances their chances of survival.
Another example is, "In a summertime field—all brown soil and green and golden plants—white rabbits are more visible and easier to catch." Here, the cause is the summer field conditions that make the white rabbits stand out against their surroundings, leading to the effect that they become more vulnerable to predators.
Both examples show a clear relationship where specific environmental factors lead to certain outcomes impacting the rabbits' survival, thereby highlighting the cause and effect structure used by the author.