EVOLUTION

2. a reproductive barrier that prevents fertilization
5. is a structure that can develop differently over time
6. is a theory that suggests that meteorites or comets caused dinosaurs to become extinct in Cretaceous perio
7. is slow and steady speciation
10. carry dormant plant embryos packaged with a food supply
11. according to him all changes in nature are gradual
12. who proposed the theory of biological evolution by natural selection
13. small evolutionary changes that accumulate in a population
14. is the science of describing, naming, and classifying species
16. is the study of past life
19. a speciation that occurs in a shared habitat
20. proposed the first scientifically testable evolutionary theory

1. were the first plants to evolve seeds and produce pollen
3. are for obtaining water and minerals, while physically anchoring the plant in the soil
4. marks the end of the line
8. it is a dating that estimates fossil age using rock layers
9. slower and results from large-scale changes
15. a reproductibe barrier that prevents development of fertile offspring
17. is a selection that is the identification by humans of desirable trait in plants and animals
18. are the preserved remains or traces of animals, plants and other organisms from the past