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15
×
Which places are in big danger from alien invasions today?
islands (like Australia)
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15
×
Correct the sentence: You really should to go and see a doctor about that.
should go
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baam
Lose 25 points!
Oops!
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seesaw
Swap points!
Okay!
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fairy
Take points!
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15
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25
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banana
Go to last place!
Oops!
15
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Name three ways zebra mussels are harmful.
They sink buoys. They clog pipes. They eat the plankton, leaving the fish little food.
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15
×
Where did the killer bees in Brazil originally come from?
Africa
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15
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How do rabbits upset the native ecosystems in Australia?
They destroy soil, damage farmer's crops, and wreck (=destroy) the habitat of native species.
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15
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Why do kudzu plants grow faster in the southern part of the US than in Japan?
Because the climate there is warm and humid, which is good for kudzu.
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15
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How can alien invaders dangerous to an ecosystem?
They upset the balance of an ecosystem.
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15
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Name three things humans do that speed up the pace of alien invaders?
hunt, gather, farm
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15
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Who sped up the the pace (made it faster) of alien invasions?
Humans (!!!)
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15
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What does a healthy ecosystem need?
A balance between prey and predators
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15
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Why did ecosystems stay in balance for most of Earth's history?
Because they could change GRADUALLY over time.
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banana
Go to last place!
Oops!
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shark
Other team loses 25 points!
Okay!
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shark
Other team loses 20 points!
Okay!
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lifesaver
Give 25 points!
Oops!
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baam
Lose 5 points!
Oops!
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rocket
Go to first place!
Okay!
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fairy
Take points!
5
10
15
20
25
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baam
Lose 25 points!
Oops!
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eraser
Reset score!
Oops!
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seesaw
Swap points!
Okay!
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fairy
Take points!
5
10
15
20
25
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banana
Go to last place!
Oops!
15
×
You have been walking for ten hours. You ______ exhausted.
can be
must be
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