Function. A UPC code is a 12-digit number with the bar code comprised of 7-bit codes that represent each digit in the sequence.There are exactly 30 bars in the UPC code sequence, including the start and end bars.The UPC code is read by a digital scanner that allows it to interpret each of these bars and match it up with a database for speedy check out.here are exactly 30 bars in the UPC code sequence, including the start and end bars. The UPC code is read by a digital scanner that allows it to interpret each of these bars and match it up with a database for speedy check out.
The Sun is the primary source of energy for nearly all biological systems. Sunlight allows plants, algae and cyanobacteria to use photosynthesis to convert carbon dioxide and water into organic compounds like carbohydrates. This process is the fundamental source of organic material in the biosphere.
The concept of primary energy is used in energy statistics in the compilation of energy balances, as well as in the field of energetics. In energetics, a primary energy source refers to the energy forms required by the energy sector to generate the supply of energy carriers used by human society.