Examlex
What is the mass percent of a sodium fluoride solution prepared by dissolving
Of sodium fluoride into
Of water?
Homo Habilis
An extinct species of early human that lived approximately 2.4 to 1.4 million years ago, known for its use of simple stone tools.
Homo Erectus
An extinct species of hominid that lived throughout most of the Pleistocene geological epoch, known for being one of the first early humans to have a stature similar to that of modern humans and to use fire.
Bipedalism
The ability to walk upright on two legs, characteristic of humans and their ancestors.
Ultraviolet Sun Radiation
A type of electromagnetic radiation emitted by the sun that has shorter wavelengths than visible light, can cause skin damage, and is instrumental in the production of vitamin D in the skin.
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