1 Hydrogen is the most abundant element in the universe. 2  Hydrogen isn't common in a pure form on Earth, but is mostly found as part of water. 3  Hydrogen is the main fuel of stars and the only fuel for red dwarfs. 4  The whole universe is thought to have been formed by a Hydrogen nucleus.
Noun. 1. hindlimb-a posterior appendage such as a leg or the homologous structure in other animals. hind limb. hind leg-the back limb of a quadruped. limb-one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper. 1  Facebook.
The hindbrain is located toward the rear and lower portion of a personâs brain. It is responsible for controlling a number of important body functions and process, including respiration and heart rate.The brain stem is an important part of the hindbrain, and it controls functions that are critical to life, such as breathing and swallowing.he pons is the part of the hindbrain located above the medulla. It forms a kind of bridge between the medulla and the cerebellum. This structure relays messages between the cerebellum and the cerebrum, which is part of the forebrain.