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The two main categories are convenience goods and shopping goods; two lesser categories are specialty items and unsought goods.
Deoxyribose and Ribose
botany and zoology.
descriptive and inferential
IT is separated into two main categories (1) those which process information, such as computer systems, and (2) those which disseminate information, such as telecommunication systems.
Formed elements is cellular potion of the blood. three major categories are leukocytes, platelets and erythrocytes.
animal and vegetable
linear and non-linear resistor
The two main categories of luster are metallic and non-metallic. Metallic luster appears shiny and reflective like metal, while non-metallic luster includes categories such as vitreous (glassy), pearly, greasy, and dull.
The two main categories for white blood cells are granulocytes (neutrophils, eosinophils, basophils) and agranulocytes (lymphocytes and monocytes). Granulocytes contain granules in their cytoplasm, while agranulocytes do not.