| Word | Meaning |
| Meteorite | A large piece of rock that falls from the sky onto the earth |
| Biomolecule | A chemical molecule that builds the body of a living thing |
| Prokaryote | A very simple single-celled living thing with no nucleus |
| Eukaryote | A living thing whose cell has a separate nucleus |
| Eon | The largest unit of the geological time scale |
| Era | A smaller block of time inside an eon |
| Period | A still smaller block of time inside an era |
| Trilobite | An invertebrate animal of the Palaeozoic sea |
| Pteridophyta | The group of non-flowering plants such as ferns |
| Gymnosperm | A cone-bearing plant that makes seeds but no flowers |
| Angiosperm | A flowering plant |
| Herbivore, carnivore, omnivore | Animals that eat plants, animals that eat meat, and animals that eat both |