Extincton- part 2 (Unit 3)

Question 1

Extinction

Answer 1

Adjective, no members of a species survive. None are alive anywhere. T-Rex, Passenger pigeon

Question 2

Extirpation

Answer 2

Elimination of all populations in one limited area (grey wolves in Utah)

Question 3

Are extinctions mass extinctions

Answer 3

No! Only a few species can go extinct, doesn’t have to be one catastrophic mass death of a lot of species.

Question 4

What can cause extinction

Answer 4

Result of increased mortality. Higher death rate. Or, decreased natality. Lower birth rate. Or both

Question 5

Example of lowering natality

Answer 5

Long-term climate reversal (wet and cool to warm and dry). Exert physiological stressed that reduce reproduction.

Question 6

Example of decreased natality and increased mortality

Answer 6

Climate change

Question 7

Causation mistake

Answer 7

Often we look for a single culprit of extinctions. Climate change, volcano, or asteroid?

Often there will be more than one answer.

Question 8

Single-cause exceptions

Answer 8

Meteor size of earth hits everything.
Endemism- things only found on high isolated, oceanic islands
-large enough volcano

Question 9

Madagascar

Answer 9

Endemism island it is not a proponent of volcanic disruption. Humans are more sufficient at causing extinction here

Question 10

Examples of endemism volcanos

Answer 10

Krakatua- Erupted in and basically killed everything on it.
Mt. Vesuvius buried Pompeii and Herculaneum.

Question 11

Are extinctions rare or common

Answer 11

Common. VERY COMMON

Question 12

Most species to have existed are extinct

Answer 12

True of plants and animals. Dinosaurs never saw grass.

40 million species alive now (excluding microorganisms)
Estimated 5-50billion existed in earth’s history.

Only ,1% of species alive now

Question 13

Did all extinctions leave descendants

Answer 13

No.