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.
Living organisms are able to exist because of a continual input of energy. Part of this energy is used to carry out essential functions- such as maintenance, growth and reproduction- and the remainder is lost in the form of heat. 2. The primary source of energy for most living organisms is the sun.