Evidence of Evolution

2. Comparing structures of two different species.
4. The time it takes for half the radioactive atoms in the substance to decay.
5. The representation of the evolutionary history and relationships between groups of organisms.
6. A diagram where all the members of a clade, including the common ancestor, are shown.
9. The process of forming a fossil from a living organism.
10. The change in heritable characters of a population or species over time.
12. Rocks formed from pre-existing rocks or pieces of once-living organisms.
15. The study of where in the world plants and animals live.

1. A period of time marked by certain characteristics.
3. When one ancestral species evolves into one or more new species.
7. Estimating the age of rocks or fossils in (millions of) years.
8. The result of natural selection.
11. FOSSIL The preserved impressions of an organism.
12. A group of individuals that actually or potentially interbreed in nature.
13. The study of the development of the anatomy of an organism to its adult form.
14. Layers of rock or soil that contain evidence of past life.