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This large farm animal, milked twice daily, supplies the dairy that becomes butter, cheese, and yogurt.
Difficulty: EasyThis farming method, practiced in ancient Mexico and Southeast Asia, involves growing crops on floating beds in shallow lakes.
Difficulty: MediumThis phenomenon describes the inverse relationship between stomatal conductance and atmospheric CO2 concentration observed across geological time and during experimental CO2 enrichment.
Difficulty: HardThis popular red fruit, often associated with teachers, keeps the doctor away according to the famous saying.
Difficulty: EasyThis heavy telescoping lid protects the hive from rain and predators while providing additional insulation.
Difficulty: MediumThis protein-rich legume from East Asia is crushed for cooking oil, pressed into tofu, and fed to livestock worldwide.
Difficulty: MediumThis comprehensive 12-volume Roman agricultural encyclopedia, written in the 1st century CE, remained the standard farming reference for over 1,500 years.
Difficulty: HardThis number-based system, developed by the USDA, helps gardeners determine which plants can survive winters in their geographic location.
Difficulty: Easy