Across
- 4. the time it takes for half the radioactive atoms in the substance to decay
- 6. a group of genetically similar organisms that can potentially interbreed to produce viable offspring
- 11. fossil the preserved impressions of an organism, may take the form of footprints, burrows or coprolites (fossilised faeces).
- 12. comparing structures of two different species
- 13. A diagram that shows all the members of a clade, including the common ancestor
- 15. the study of where in the world plants and animals live.
- 16. A diagram that shows the evolutionary history of a species or group of species, also known as phylogenetic tree
Down
- 1. Estimating the age of rocks or fossils in (millions of) years
- 2. the change over time to better suit the environmental pressures, is the result of natural selection.
- 3. evolution occurs when one ancestral species evolves into one or more new species
- 5. a process of forming a fossil from a living organism
- 7. forms in layers called strata, when sediment is compressed and glued together by chemical reactions and pressure
- 8. change in heritable characters of a population or species over time
- 9. method to compare different animals at different stage of development
- 10. Sedimentary rock forms in layers
- 14. a division of time that is a subdivision of a period