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7. The graph below shows the population of three different families of marine organisms along

five different mass extinction events. Each colour on the graph represents a family of

organisms, and the Y axis shows how many species belong to that family.

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a. What stage of population growth is displayed at point '0' on the graph above? [1 mark]


b. The Extinction Event that occurred at point 3 was particularly significant. Using the

graph, explain how this event impacted each marine family. [2 marks]


c. The extinction events mapped above had significant impact on marine life. What type of

event could have a similar impact on the human population? [1 mark]

Image transcriptions

Cambrian Paleozoic Mesozoic - Cenosoic 900- phase phase phase 5 Number of Marine Familes 2 3 4 600- 300 Md Pz Cm V Cm O S D C P Tr J K T Paleozoic Mesozoic Cz 600 400 200 Geologic Time (mya)

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Subject: Biology, Science
Cambrian Paleozoic Mesozoic - Cenosoic 900- phase phase phase 5 Number of Marine Familes 2 3 4 600- 300 Md Pz Cm V Cm O S D C P Tr J K T Paleozoic
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