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 the region of the brain formed by the pons, medulla oblongata (also known as just the medulla), and the cerebellum. Together, these three structures govern our autonomic, or 'automated' body systems, controlling everything from our heart, breathing, and sleep patterns to our bladder function, sense of equilibrium, and fine motor control.