Flashcards
extinction (4)
Cards in this deck (6)
- 1What is extinction?Total disappearance of a species.
- 2☼What natural factors cause extinction?☼-Predation by other organisms
-Disease
-Habitat destruction (caused by what?)
-Collapsing food web (caused by what?)
-Climate change
-Sea level change (usually regression)
-Competition
-Extraterrestrial causes (impacts)
-Combination of factors - 3What are mass extinctions?-A large percentages of lifeforms go extinct relatively quickly
- 4When in geologic history did the major mass extinctions occur??
- 5☼What are the 5 most significant mass extinctions in Earth history?☼1) end-Ordovician
2) Near-end Devonian
3) Permian-Triassic boundary
4) end-Triassic
5) Cretaceous-Tertiary boundary (K-T bdy.) - 6☼What are adaptive radiations?☼-Rapid evolution that usually follows mass extinctions.