Unit A | Topic 7 | Extinction and ecological footprints Flashcards
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Why is iridium important when studying bones of extinct animals?
Iridium comes from asteroids, which can lead to evidence that the organism was killed by an asteroid
What percentage of of species that have ever lived on earth are extinct?
98%
How many mass extinctions have occurred in earths history?
5
What is the nickname of the most devastating mass extinction event?
End Permian
What is the name of the current EPOCH (current point in history)?
Anthropocene
How much life would be lost if the oceans pH level reached 7.8?
1/3 of all ocean life
Definition of:
Extinction
The dying out of an entire species
Definition of:
Extirpation
The local extinction or disappearance of a species from an area
True or false:
A species that has experienced extirpation can return to an area
True
Extirpation species can return to an area after the extirpation event occurred
Definition of:
Endagered
A species in immediate danger of extinction or extirpation
What are some natural causes of extinction and extirpation?
- Large natural disasters
- disease
- low birth rates and high death rates
Does a mass extinction take place over a short or long amount of time?
A short amount of time
Does a short-term extinction take place over a short or long amount of time?
A long amount of time
How do humans cause diversity to decrease?
- Deforestation
- Carbon emissions
- Large ecological footprints
Definition of:
Indicator species
A species that indicates the current state of the environment they live in
