Adding grass to places such as hay fields, golf courses and highway shoulders serves many purposes. First, the grass adds to the aesthetic appeal of the area, making it more pleasant to look at. The grass also helps prevent soil erosion by keeping the soil in place. In golf courses, the grass is important in making the golf ball roll properly for optimal playing experience. Another important role of the grass, regardless of location, is the addition of water to the atmosphere through transpiration. This yields to more rains and a better climate of the region.
Active muscles demand huge amounts of oxygen, and the circulatory system works hard to provide it. Blood carries oxygen to the muscles. When the body is at rest, blood carries nutrients to the muscles so that they can repair and rebuild themselves. Blood also carries away the waste products that hard-working muscles produce, back out through the lungs to be filtered.
so they Circulatory system xx muscular system :)
Biological augmentation is a process that uses organisms to add essential materials to a degraded ecosystem. It involves the addition of archaea, or bacteria cultures required to speed up the rate of degradation of a contaminant, this is supplementation application of non-toxic, natural, beneficial microbes, enzymes and minerals to enhance the rate of degradation.