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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The loss of a natural habitat is called?

• Habitat development
• biodiversity
• Pollution
• Habitat destruction

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Species that normally live and thrive in a particular ecosystem

• native species

• exotic specis

• invasive species

• keystone species

The consumption of a resource faster than it can be replenished is known as

• bioaccumulation

• urban development

• resource depletion

• degradation

The growth and expansion of cities such that the land is no longer in its natural state

• urban development

• bioaccumulation

• erosion

• greenhouse effect