Biology

5. Study of embryos and their development.
6. A group of organisms that can interbreed and produce fertile offspring.
7. Study of the geographic distribution of species over time.
8. A subdivision of geological time marked by significant events.
12. Method to determine the exact age of a fossil or rock using radioactive decay.
13. Gradual change in species over generations.
15. Evolutionary history and relationships among species.
16. Process of preserving remains or traces of organisms.

1. Study of body structures across species to understand evolutionary links.
2. Time taken for half of a radioactive substance to decay.
3. Layers of rock or soil with consistent characteristics.
4. Rock formed from compressed layers of sediment, often containing fossils.
9. A branching diagram showing evolutionary relationships.
10. A trait that improves an organism’s chance of survival and reproduction.
11. Process where related species evolve different traits.
14. Fossilized evidence of an organism’s activity, like footprints or burrows.