HORTICULTURE

Detailed explanation-1: -Whittlesey uses both natural (soil, climate, etc.) and human-made (machine, labor, etc.) variables to classify the world agricultural region. He believed that agriculture meant both crop growing and animal husbandry, as both the activities depended on the type of soil.

Detailed explanation-2: -Derwent Whittlesey is famous for developing the concept of eleven distinct agricultural regions in the 1930s. Whittlesey divided these eleven regions into some that were important to developed societies (e.g. livestock farming) and some that were important to developing societies (e.g. pastoral nomadism).