Why is it easier to demolish a building than it was to build it?

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

Common symptoms of an iron-defiency anemia include muscle weakness shortness of breath and lightheadedness why does iron deficiency causes these symptoms

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.