NUMBER OF FAMILIES 900 600 300 0 V 600 Cm € 0 Pz S D с PR J 400 200 GEOLOGIC TIME (106 yrs) Md K 1900 1 T Figure 10.1 -

Post by **answerhappygod** » Mon Jul 11, 2022 2:32 pm

: 1 (138.27 KiB) Viewed 222 times

NUMBER OF FAMILIES 900 600 300 0 V 600 Cm € 0 Pz S D с PR J 400 200 GEOLOGIC TIME (106 yrs) Md K 1900 1 T Figure 10.1 - Family level diversity of marine organisms preserved in the fossil record throughout the Phanerozoic Eon, showing the Cambrian (Cm), Paleozoic (Pz), and Modern (Md) evolutionary faunas. The dotted area at the top represents families not included in any of these major faunas.
CAMBRIAN FAUNA 1 Trilobito 2. Inarticulato 3. Hyalitha 6. Articulato PALEOZOIC FAUNA 7. Crinoidea 14. Bivalvia € SD C PR 8. Anthozoa 15. Gastropoda W 17. Gymnalcemata (US) 9. Ostrocado MODERN FAUNA 4. Monoplacophora 10. Cephalopoda Ve SD CPR J 16. Malacostraca V 600 € 11. Stenolaemata 12. Stelleraida 21. Osteichthyes 18. Demospongia 19. Rhizopodea 20. Echinoidea 22. Chondrichthyes SD 400 5. Excrinoidea 13. Graptolithina 23. Reptilia 24. Mammalia T +200 400 200 O 600 400 200 NUMBER OF FAMILIES CIPRJ 200 Figure 10.2 - The three "evolutionary faunas" making up the majority of the Phanerozic marine fossil record. Representative groups are illustrated and ranked by importance. NUMBER OF FAMILIES NUMBER OF FAMILIES
Part I. Use the graphs in figures 10.1 and 10.2 to answer these questions. 1. How did the diversity of marine organisms (shown by the number of families in figure 10.1) change from the beginning of the Cambrian period to the end of the Ordovician period? (Cambrian is shown as C with a line through it and Ordovician as on the graph.) 2. What happened to the number of marine families at the end of the Permian period (shown as P on figure 10.1)? What as going on at this point in Earth's history that caused this change in diversity? 3. How does the diversity of the Paleozoic Fauna compare to the diversity of the Modern Fauna during the Silurian period (shown as S on the graphs)? How does the diversity of these two faunas compare to today, shown on the far-right side of the graphs?