Soil classification is partially determined by the presence of organic material, such as humus. Which would have more humus—a desert or a forest—and why? Check all that apply.
1. a forest because it has more trees to provide plant litter
2. a desert because it has soil with a larger particle size
3. a forest because it has more animals to mix the soil
4. a forest because the trees prevent rain from reaching the soil
5. a desert because the dry air decomposes plant litter