Our galaxy's arms spiral outward. The Milky Way is a type of galaxy called a spiral galaxy.
The shape of our galaxy, the spiral, is not irregular. Nearly 70% of the galaxies closest to the Milky Way are spiral. Our galaxy does not contain the universe: the universe contains at least one hundred billion galaxies.
These small cells seem to sound an alarm when infectious agents invade your blood. They secrete chemicals such as histamine, a marker of allergic disease, that help control the body's immune response.
Irrigation system gave the ancient civilizations fertile land which helped crops grow. It also allowed for ease of watering which made the process of farming faster.
