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The two components of a thunderstorm are an updraft and a downdraft. The updraft is responsible for lifting warm, moist air to form the storm clouds, while the downdraft brings cold air and precipitation back down to the ground.
The two pyrimidines, cytosine and thymine, are composed of a single-ring structure containing carbon and nitrogen atoms. These nitrogenous bases are essential components of nucleotides in DNA and RNA molecules.
Two or more components together are called a system.
The two main feldspar groups are potassium feldspar (orthoclase and microcline) and plagioclase feldspar (albite and anorthite). They are common rock-forming minerals in the Earth's crust and are essential components in many igneous and metamorphic rocks.
The dimer in lipids is called a phospholipid. It consists of two fatty acid chains linked to a glycerol molecule, with a phosphate group attached to the glycerol backbone. These molecules are essential components of cell membranes.