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.
Forelimb s in mammals have varying functions but are all homologous. A forelimb is an anterior limb (arm, leg, or similar appendage) on a terrestrial vertebrate 's body. For quadrupeds, the term foreleg is often used instead. (A forearm however is the part of the arm or forelimb between the elbow and the wrist .).