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. This area of the brain contains structures outside of the cerebral cortex: the pons, medulla oblongata, and cerebellum. The spinal cord becomes the medulla oblongata as it makes its way into the cranium.This main nervous system connector carries messages between the spinal cord and brain.he hindbrain. This area of the brain contains structures outside of the cerebral cortex: the pons, medulla oblongata, and cerebellum. The spinal cord becomes the medulla oblongata as it makes its way into the cranium.