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    Exam 4: Ecosystems: What Are They, and How Do They Work
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    What Is the Estimated Number of Species on Earth
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What Is the Estimated Number of Species on Earth

Question 20

Question 20

Multiple Choice

What is the estimated number of species on Earth? 


A)  about 3 thousand to 100 thousand 
B)  about 3 million to 100 million 
C)  3 billion to 100 billion 
D)  about 3 trillion to 100 trillion

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