biology

2. The study of similarities and differences in the body structures of different organisms.
5. The study of where species live on Earth and how they got there.
6. Evidence of an organism's activity, like footprints, burrows, or feces, rather than the organism itself.
9. The time it takes for half of a radioactive substance to decay.
10. A division of geological time that is shorter than a period and marked by significant events in Earth's history.
12. A trait that helps an organism survive and reproduce in its environment.
14. The study of embryos and their development, often used to find evolutionary connections.
15. A group of similar organisms that can breed and produce fertile offspring.
16. The process by which different species develop and change over long periods of time through natural selection and other mechanisms.

1. Rock formed by layers of sediment (like sand, mud, or small rocks) that have been compressed over time.
3. Layers of sedimentary rock, often used to study Earth's history and the age of fossils.
4. The process by which living things become fossils, preserving their remains in rock.
7. The evolutionary history and relationships among species or groups of species.
8. A branching diagram showing the evolutionary relationships between species based on shared traits.
11. When two or more species that share a common ancestor become more different over time, usually because they adapt to different environments.
13. dating – A method of determining the exact age of rocks, fossils, or artifacts using techniques like radiometric dating.