Unit 3: Population Dynamics

What is true of extinction?

• Extinction is when all individuals of a species have died out

• Extinction happens less often on islands

• Something is extinct when I can no longer see it

• Extinction can be reversed just like in Jurassic Park, which is a documentary.

What is the "normal rate of extinction", according to the article we read?

• Extinction happens normally at a rate of a couple species per million years

• Extinction happens every year.

• Nothing goes extinct normally.

• 55 out of 2280 mammal species have gone extinct.

What is a mass extinction?

• When at least 3/4 of species go extinct.

• When a big animal goes extinct

• When a species goes extinct once every million years or so

• When you workout and lose some weight

How many mass extinctions are there?

• at least 5 in the past, and 1 happening now

• zero

• one

• too many to count, tbh

The sixth mass extinction is:

• something that happened in the past

• caused by humans and happening now

• the first time anything has gone extinct

• something we should all be proud of

What is one way humans can negatively alter an environment?

• removing toxic waste

• replacing native organisms after hunting

• planting trees

• introducing invasive species

Which of the following are evidence that we are in the Sixth Mass Extinction? (check all that apply)

• In the past 500 years a minimum of 80 of 5570 species of mammals have gone extinct

• By 334 years from now, 75% of all mammal species will be gone

• The current extinction rate is between three to 80 times too high

• bout 1% to 2% of species already are extinct today, and 20% to 50% are threatened—numbers that approach those of the great mass extinctions of the past

Human population growth is an example of _____ growth.

• exponential

• logistic

• boom-crash

• carrying capacity

This graph shows an example of _____ growth.

• exponential

• logistic

• boom-crash

• carrying capacity

This graph of reindeer population shows an example of _____.

• exponential

• logistic

• boom-crash

• carrying capacity