Final answer:
The highest predation level in enclosures with light-colored soil cannot be determined from the provided information, but temperature and humidity are significant environmental variables that affect organism distribution.
Step-by-step explanation:
The combination of independent variables that led to the highest predation level in enclosures with light-colored soil is not provided in the reference information. However, based on what is known about biomes, environmental variables, and the correlation between Earth's temperature and CO2 concentration, we can infer that factors such as temperature and humidity play significant roles in the distribution of organisms and their activities such as predation.
High temperature may increase an animal's metabolic rate, leading to higher predation rates. Concurrently, high humidity could lead to reduced evaporation rates, which may affect the availability of water and consequently influence the behavior of predators and prey. Without further context or data, it is not possible to provide the specific answer.