The lymph is moved through the body in its own vessels making a one-way journey from the interstitial spaces to the subclavian veins at the base of the neck. Since the lymphatic system does not have a heart to pump it, its upward movement depends on the motions of the muscle and joint pumps.
A biological community of interacting organisms and their physical environment.
These are called Temperate zones because of the variety in temperatures throughout the year and the more distinct seasonal changes
