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.
Energy from the Sun is crucial to life on Earth. Sunlight heats the Earth's surface, which in turn heats the atmosphere, maintaining temperatures suitable for life and driving the planet's weather systems. Plants make use of the Sun's electromagnetic energy for photosynthesis, the method by which they produce food. Solar energy is converted to chemical energy that powers the processes that allow plants to make the glucose they need to survive from carbon dioxide and water.