Blog Assignment #8: (Part 1 of 6 posts) Part 2 Change: Deep Time

Change: Deep Time

1. Atmosphere forms: Precambrian Eon 4,550-543 mya-Hadean 4,500 mya

2. Earth's core forms: Precambrian Eon 4,550-543 mya-Hadean 4,400 mya

3. First living organisms evolve(prokaryotic cells): Precambrian Eon 4,550-543 mya-Hadean 3,850 mya

4.First eukaryotic cells evolve: Precambrian Eon 4,550-543 mya-Archaean 2,700 mya

5. First multicellular organisms evolve(algae): Precambrian Eon 4,550-543 mya-Proterozoic 1,200 mya

6. Ozone layer forms: Precambrian Eon 4,550-543 mya-Proterozoic 600 mya

7. First Chordates evolve (what's a chordate?): Paleozoic Era 543-248 mya-Cambrian 535 mya
A chordate are any of the numerous animals belonging to the the family Chordata having at some stage of development a dorsal nerve cord.

8. First land plants evolve: Paleozoic Era 543-248 mya-Ordovician 480 mya

9. First land animals (bugs) evolve: Paleozoic Era 543-248 mya-Carboniferons 420 mya

10. First land vertebrates evolve (what's a vertebrate?) Paleozoic Era 543-248 mya-Devonian 375 mya
A vertebrate is an animal having a backbone or spinal column.

11. First flowering plants evolved: Paleozoic Era 543-248 mya-Devonian 360 mya

12. First reptiles evolve: Paleozoic Era 543-248 mya-Permian 275 mya

13. Pangaea forms (what is Pangaea?): Paleozoic Era 543-248 mya-Permian 280 mya

The Pangaea is a theory that states that all present continents were once together and collectively known as a "supercontinent" called Pangaea.

14. First mammals evolve: Mesozoic Era 248-65 mya-Triassic 220 mya

15. First birds evolv: Mesozoic Era 248-65 mya-Jurassic 150 mya

16. First primates evolve: Cenozoic Era 65mya-Present Time-Paleocene 60mya

17. Continents reach their present-day formation: Cenozoic Era 65mya-Present-Eocene 40mya

18. First apes evolve from the primate lineage: Cenozoic Era 65mya-Present-Oligocene 25 mya

19. Hominids evolve from the ape lineage (what is a hominid?): Cenozoic Era 65mya-Present-Pliocene 5.2 mya
A hominid is any member of the biological primate family Hominidae.

20. First early humans evolve from the hominid lineage: Cenozoic Era 65mya-Present-Pleistocene 0.16 mya

21. Modern humans evolve from the human lineage: Cenozoic Era 65mya-Present-Pleistocene 0.1 mya