Card Set Information
method of establishing the age of a material
the mass number of an isotope is the total number of protons and neutrons in the nucleus
the nucleus releases particles or radiant energy until the nuclei become stable.
isotopes that undergo radioactive decay are known as radioactive isotopes
the length of time it takes for half of the isotope to decay to stable form
spherical in shape and composed of many protein molecules.
collections of droplets that are composed of molecules of different types, including lipids, amino acids and sugars.
molecule that acts as a catalyst and promotes a specific chemical reaction
a related group of unicellular organisms, many of which can thrive under harsh enviroments
autotrophs recieve energy through chemosynthesis instead of photosynthesis
a layer of which collects uv rays to protect plant and animal life