Traditionally, invitations go out six to eight weeks before the wedding -- that gives guests plenty of time to clear their schedules and make travel arrangements if they don't live in town. If it's a destination wedding, give guests more time and send them out three months ahead of time.
The human body is made up of several organ systems that all work together as a unit to make sure the body keeps functioning. There are ten major organ systems in the body, each of which plays a different role in helping the body work. This system is made up of the heart, blood, blood vessels, and lymphatics.
An organ is a group of tissues that perform a specific function or groups of functions. Animal organs include the brian, the lungs, the liver, and the stomach and some plant organs are leafs, roots, and the stem. Your senses are also organs-your ears, tongue, eyes, nose, and skin are sensory organs.