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.
Cats walk on the tips and balls of their toes or âdigitsâ. This is known as digitigrade walking. Each digit or toe has a claw, and there are usually five toes or digits on each cat forefoot and four on each hindfoot. A catâs and a dogâs paw pads are spongy pads of thick skin beneath each foot, assisting with silent movement and protecting the underlying bones and joints from injury during running and jumping.