threats to biodiversity

What are the ways in which species lose their habitats?

• disruption

• pollution

• destruction

• background extinction

Approximately how much greater is the current background extinction compared to the normal rate?

• 1 time

• 10 times

• 100,00 times

• 1000 times

Which condition triggered the chain of events that caused kelp forests to begin to disappear? 

• a decrease in the amount of plankton

• an increase in sea urchins

• an increase in the number of sea otters

• pollution caused by pesticides

Overfishing is one type of......

• natural disaster

• consuming

• overexploitation

• Mass extinction

When a large percentage of all living species become extinct in a relatively short period of time.

• massive extinction

• background extinction. 

• mass extinction. 

• overexploitation