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Section 3.3
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1
Which of the following countries has had over fifty percent of their tropical rainforests lost due to deforestation since 1990?
A)Burma
B)Ecuador
C)The Philippines
D)Comoros
2
What term best describes zebra mussels?
A)an alien species
B)an invasive species
C)an endangered species
D)an overexploited species
3
Background extinction occurs when…
A)there is a sudden change in Earth’s ecosystem.
B)there is a massive volcanic eruption over an extended area.
C)when ecosystems gradually change over long periods of time.
D)human activities lead to the sudden change in species populations.
4
Which of the following would be a natural source of habitat destruction?
A)deforestation
B)wildfires
C)draining wetlands
D)damming rivers
5
Scientists hypothesize that the root cause of the current biodiversity crisis is …
A)global warming.
B)high rates of species extinction.
C)natural sources of habitat destruction.
D)the actions of humans.





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