Human Impacts on Ecosystems Flashcards
1
Q
What is mass extinction?
A
An event that causes over 50% of species alive at the time to become extinct.
2
Q
When was the Cretaceous-Palaeogene extinction?
A
65 million years ago
3
Q
List four causes of mass extinction.
A
- Drastic changes in temp/carbon levels
- Changes in water levels
- Volcanic activity
- Meteors
4
Q
What are five characteristics of a good bioindicator?
A
- Affordable to study
- Abundant
- Sensitive to a specific disturbance
- Been previously studied
- Well known ecology
