animal and vegetable
The two main categories are convenience goods and shopping goods; two lesser categories are specialty items and unsought goods.
Implied
Serif and Sans Serif
The first scientist to classify animals based on observable features (if that's what you're asking) was Aristotle. He divided all the animals into three main categories: those that run, those that swim, and those that fly. He also divided those genres into subcategories, but I don't have any information for you about the specifics. If you're wondering who invented the modern system of taxonomy, I'm fairly certain it evolved over many centuries from Aristotle's original system. There are probably many scientists who have transformed and revised it over time.
Aristotle was not a chemist.
4 categories 1. Record of the Year 2. Album of the Year 3. Song of the Year 4. Best New ArtistAnswerAbove are the "Big Four" categories. But as of 2015, there are 25 other main categories, and 79 sub-categories.
There are 22 Main Categories on WikiAnswers.
Nichomachus (Aristotle's father), and Plato. There are many more but these are the main people.
Aristotle believed the main purpose of the human brain was to cool the blood.
Main categories in taxable bond funds are corporate bond funds, high-yield funds, world bond funds, government bond funds, and strategic income funds. The main tax-free bond fund categories are state municipal bond funds
The four main categories of organic compounds in organisms are proteins, carbohydrates, lipids, and nucleic acids.
The main categories of food are:CarbohydratesFatsProteinsVitaminsMinerals