Threats to Biodiversity

Biodiversity refers to

• extinct species
• the variety of species on Earth
• nonrenewable resources
• the rate of species decline

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1. What makes a species invasive?

• Moving to a new ecosystem and taking resources from natives 
• Not having papers
• Species that can't adapt
• Plants that take up too much space

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If a blue catfish is introduced and eats the large fish who eat the smaller fish, what will happen to the population of the smaller fish?

• Increase
• Decrease
• Stay the same
• No affect on smaller fish

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Invasive species have a negative impact on...

• the ecosystem
• the economy
• Both the ecosystem and the economy
• None of these

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Why do the populations of invasive species grow so quickly? 

• Invasive Species are native to an area. 
• Invasive species are prey to many animals.
• Invasive species have no predators.
• Invasive species keep the ecosystems in equilibrium.

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An endangered species is

• One whose numbers are so small that it is at risk of extinction
  
• One whose not been spotted after many years.
• One whose numbers are abundant.

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A species is defined as endangered when it

• suffers from damage to its habitat.
• suffers from disease or predation.
• when there are hazards to the continued life of the species.
• all of the above

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What are the greatest problems facing plants, animals, and people?

• introducing new species that  can cause problems 
• habitat destruction
• illegal hunting 
• all of the above

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The primary causes of extinction (and endangerment and threatened status) is...

• polar ice cap melting

• global warming

• habitat loss and degradation

• burning of fossil fuels

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How does habitat fragmentation reduce genetic diversity in species?

• Habitat fragmentation makes nonnative species introduction possible.

• Habitat fragmentation opens migration routes.

• Habitat fragmentation isolates a large population into smaller groups.

• Habitat fragementation encourages open gene flow.

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