Soil moisture. Soil moisture affects the soil biota in two ways. Biologically water is essential for life and for enzyme activity and metabolism and, is a solvent for biological nutrients and other chemicals. Physically, soil moisture affects soil temperature (water is good conductor of heat) and soil aeration.oil moisture. Soil moisture affects the soil biota in two ways. Biologically water is essential for life and for enzyme activity and metabolism and, is a solvent for biological nutrients and other chemicals. Physically, soil moisture affects soil temperature (water is good conductor of heat) and soil aeration.
Your blood is actually always red! Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues.
Arteries appear white because they have a thick muscular wall made of three layers and do not transmit the color of the blood. Veins, conversely, have a thin translucent wall that transmits the color of the blood inside, distorting the color slightly and making it bluish. If you look at a vein in the body you can see the blood flowing inside of it, and if air bubbles get in (from an IV or from an intentional opening of the vein) you can also see the bubbles through the wall of the vein.