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viruses and infections
Elephant and OSTRICH
matter
What_are_two_major_categories_of_static_RAM_memory
macronutrients and micronutrients
macronutrients and micronutrients
Psychotic and non-psychotic
Mechanical weathering and Chemical weathering
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