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Flashcards in Extinctions And Changes In Biodiversity Deck (9)
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1

What are the 2 biggest threats to organisms from humans?

Exploitation and habitat loss

2

What factors make species more vulnerable to extinction?

-small populations and/or small geographical range
-species tied to habitats favoured by humans
-large organisms
-species higher in food chain

3

How many precious Mass Extinction events?

5
Late Ordovician
Late Devonian
Late Permian
Late Triassic
End-Cretaceous (dinosaurs)

4

What classes as a mass extinction?

75% of species left

5

What is the Pleistocene?

Period of time recently where many large mammals species were lost

6

What are the 2 hypotheses for extinction of the large mammals in present interglacial?

environmental deterioration
Human over kill

7

What are the two patterns of changes in diversity with time?

1. General increase (usually with periods of much lower numbers)
2. An increase (usually with periods of decline) then a continued decline to extinction

8

How long ago was Pangea?
What are the north and south parts called?

220mya (Triassic)
-Laurasia
-Gondwanaland is

9

3 pieces of evidence for continental drift?

-jigsaw fit
-similar geology
-similarities in fossils of plants and animals found