From its beginning, the main features of the metric system were the standard set of interrelated base units and a standard set of prefixes in powers of ten. These base units are used to derive larger and smaller units that could replace a huge number of other units of measure in existence.
There are many vitamins present in oranges. Photo Credit Medioimages/Photodisc/Photodisc/Getty Images. Oranges are well known for their high concentration of vitamin C, but the citrus fruit also contains many other vitamins and nutrients. Oranges also contain vitamin A, many of the B vitamins, and vitamin E, making them a regular part of a healthy and balanced diet. Vitamin A is an important nutrient for vision, and for healthy skin.
Citrus fruits in general are excellent sources of vitamin C, including oranges (about 75 mg), guavas, grapefruit, pineapple, and kiwi fruit. Other good sources are broccoli, green peppers, tomatoes, sweet and white potatoes, watercress, and avocado.