Agriculture: Time to use: at least one standard week. The character has a good working knowledge of crops and animal herds, and can suggest appropriate crops for a type of soil, or explain why crop yields have been affected. Ecology: Time to use: at least one standard month. The character has a good working knowledge of the interdependent nature of ecoshperes, and can determine how proposed changes will affect the sphere. This skill can be used in one minute to determine the probable role of a lifeform within it biosphere: predator, prey, symbiote, parasite or some other quick description of its ecological niche.