| A | B |
|---|
| Biogenesis | All living things come from other living things. |
| Spontaneous generation | Living things arising from non-living things. |
| Radioactive dating | Methods of establishing the age of materials. |
| Mass number | The total number of protons and neutrons in the nucleus. |
| Radioactive decay | The release of particles, radiant energy, or both. |
| Radioactive isotopes | Isotopes that give off radioactive decay |
| Half-life | The length of time it takes for one-half of any size sample of an isotope to decay. |
| Microspheres | Spherical in shape, and are composed of many protein molecules that are organized as a membrane. |
| Coacervates | Collections of droplets that are composed of molecules of different types, including linked amino acids and sugars. |
| Ribozyme | An RNA molecule that can act as an enzyme and have the ability to replicate itself. |
| Archaebacteria | Living organisms that may be similar to the first living organisms. |
| Cyanobacteria | A group of photosynthetic unicellular prokaryotes. |
| Ozone | Poisonous to both plant and animal life but in the upper atmosphere it absorbs ultraviolet radiation from the sun. |
| Endosymbiosis | A successful, mutually beneficial relationship that may explai how eukaryotes evolved. |
