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.
âHowever, whether these elements belong to the wing or hindlimb can reflect the ecology of the living species, i.e., strong fliers versus cursorial or aquatic forms.â âTroodontids, judging from their cranial anatomy and cursorial adaptations, were likely agile, fast carnivores with acute senses.â