In the classification of hazardous materials, there are nine (9) classes such as Explosives, Flammable Liquids, Flammable Solids, Corrosives, etc.
Come of these Classes are subdivided and those are called Divisions. For example, Class 4, is divided into:
Division 4.1 - Flammable Solids
Division 4.2 - Spontaneous Combustible Materials, and
Division 4.3 - Dangerous when wet material
Class 4 division 1 (more properly called Division 4.1) is for flammable solids.
There is no Class 3 Division 2; Class three has no subdivisions.
DOT Class 3 is for flammable liquids, but there is no subdivision of the class so there is no division 3 for this class.
Class 4 Division 1 (more properly called Division 4.1) is for flammable solids.
Class 4 division 1 (more properly called Division 4.1) is for flammable solids.
A material in Class 4 Division 3, more properly called Division 4.3, is a Dangerous When Wet material.
Carrots belong to the division Magnoliophyta, the phylum Anthophyta (angiosperms), and the class Eudicotyledonae (dicots).
Class 4 division 3 (more properly called Division 4.3) is a Dangerous When Wet Material.
Class 4 Division 2, more often called Division 4.2, is for spontaneously combustible materials
DOT Class 2, Division 1 (more properly called Division 2.1) is for flammable gases.
Poisonous materials are found in DOT division 6.1.
Class 6, Division 2 (more properly called Division 6.2) is for infectious agents.