unit 7

3. layer-digestive system, trachea, lungs
5. record-organisms on Earth have been changing as seen in preserved organisms Convergent evolution-organisms under similar environmental pressures evolve similarly
7. outermost layer-skin, hair, nails
10. -study of embryos and their development, formation, growth, development
13. changes over time compound into large changes
17. structures organisms have unused organs or structures
20. - early stage of embryonic development - follows Blastula - formation of the layers, Ectoderm - mesoderm - endoderm Zygote - initial cell formed after fertilization of egg
21. genus species used to make scientific name for organism

1. - major group of animals characterized by their embryonic development Derived character - feature present in organism that was absent in last common ancestor group Protostome - characterized from embryonic development - phyla
2. middle layer in germ layer-gives variety of structures in body
4. - early stage of embryonic development, occurs after fertilization of egg + formation of zygote
6. theory-first eukaryotes evolved from 1 prokaryote living within another
8. genes- master control gene, determines placement and activation development in organism clocks- Randomocks-random mutations accumulate over time at a consistent rate-# of mutations differences can be used to predict when an evolutionary split occurred
9. -2 species living in close proximity evolve in response to each other
11. radiation-single species or group diversifies into many distinct forms
12. body structures- different structures can evolve to fulfill similar demands based on environmental demands
14. section Binomial nomenclaturee-tries to show ancestry
15. small changes in a population
16. body structures- same structures can evolve for different uses depending on environmental demand
18. group-a scientific naming system used to identify organisms
19. equilibrium-long periods of equilibrium interrupted by rapid change
22. -single species or multiple species die out