Threats To Biodiversity

Question 1

Background Extinction

Answer 1

The gradual process of species becoming extinction.

Question 2

Mass Extinction

Answer 2

Is an event I which a large percentage of all living species become extinct in a short period of time.

Question 3

Natural Resources

Answer 3

Are materials and organisms found in the biosphere, like minerals, fossil fuels plants animals water clean air

Question 4

Overexploitation

Answer 4

Overuse of species with economic value a factor in species extinction.

Question 5

Habitat Fragmentation

Answer 5

The separation of an ecosystem into small pieces of land

Question 6

Edge Effects

Answer 6

Are different environmental conditions that occur along the boundaries of an ecosystem.

Question 7

Biological Magnification

Answer 7

Is the increasing concentration of toxic substances in organisms as tropic levels increase in the food chain.

Question 8

Eutrophication

Answer 8

Occurs when fertilizers animal waste and other substances rich in nitrogen

Question 9

Invasive species

Answer 9

Species that can significantly modify or disrupt the habitat.

Question 10

Ordovician period

Answer 10

Graptolites 444 million years ago

Question 11

Devonian period

Answer 11

Dinichthys 360 million years ago

Question 12

Permian period

Answer 12

Cynognathus 200 million years ago

Question 13

Cretaceous period

Answer 13

Ammonite 65 million years ago