Environmental Science – Water Pollution

Any harmful substance towards water quality and aquatic life is considered a pollutant. They can be diseases, carriers, inorganic chemicals, sediments, radioactive chemicals, heat, or feces. There are multiple ways to measure water quality, especially the water quality index (WQI) that compiles several different measurements. Biological oxygen demand (BOD) is the amount of dissolved oxygen [...]

The Circulatory System

The circulatory system has the major function of circulating blood that transports oxygen and nutrients throughout the body. Major organs are the lungs, heart, and blood vessels. The functional unit are the red blood cells. Red Blood Cell Mammals have a closed circulatory system called the cardiovascular system. The heart has one or two atria, [...]