1. High income countries
2. Upper-middle income countries
3. Lower-middle income countries
4. Low-income countries
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The World Bank divides countries into four income groups based on Gross National Income (GNI) per capita: low-income, lower-middle-income, upper-middle-income, and high-income countries. Each group represents a range of income levels to help guide development assistance and lending practices.
Plants are typically classified into four main groups: bryophytes (mosses and liverworts), pteridophytes (ferns and horsetails), gymnosperms (conifers and cycads), and angiosperms (flowering plants). Each group has distinct characteristics and reproductive structures.
A quartile divides a distribution into four equal parts, each containing 25% of the data. The first quartile (Q1) represents the value below which 25% of the data fall, the second quartile (Q2) is the median, and the third quartile (Q3) is the value below which 75% of the data fall.
The four major groups of primates are prosimians (such as lemurs and tarsiers), New World monkeys (such as spider monkeys and howler monkeys), Old World monkeys (such as baboons and macaques), and apes (such as gorillas and orangutans).
The four macromolecule groups are carbohydrates, lipids, proteins, and nucleic acids. Each group plays a crucial role in the structure and function of living organisms.
The four main microbes are bacteria,proatozoa,virus and fungus