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Phylum is the stage above class and below kingdom. There are two categories in phylum: eukaryote and prokaryote. Eukaryotes have well defined cell membranes and nuclei, while a prokaryote doesn't. This can already separate the different classes into different categories, which is evidently the goal of taxonomy -- to classify organisms.
The nervous system and the endocrine system are the two major regulatory systems in the body.
Protection and insulation are two major functions of the skin.
doodoo head
There are two principal body cavities the dorsal (posterior) body cavity and the ventral (anterior) body cavity.
Elephant and OSTRICH
matter
macronutrients and micronutrients
macronutrients and micronutrients
What_are_two_major_categories_of_static_RAM_memory
Psychotic and non-psychotic
Mechanical weathering and Chemical weathering
body and surface waves
Risk factors are divided into two categories: major and contributing. Major risk factors are as we age, our hearts tend not to work as well.
Comedies, Tragedies and Histories
SD RAM and DDR RAM
major and minor there are also others but i assume you want the two big ones