Threats to Marine life

Biodiversity refers to

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

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

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

Invasive species have a negative impact on...

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

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

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

The loss of a natural habitat is called?

• Habitat development
• biodiversity
• Pollution
• Habitat destruction

The number of different species in an area is referred to as its _______________.

• population
• genetic diversity
• biodiversity
• Niche diversity

The separation or breaking of habitats into smaller pieces is called

• habitat division

• habitat pollution

• habitat corruption

• habitat fragmentation

Species that normally live and thrive in a particular ecosystem

• native species

• exotic specis

• invasive species

• keystone species