Why Don't Scientists Know the Exact Number of Species on Earth

question 53

Multiple Choice

Why don't scientists know the exact number of species on Earth?

• A)because about 10,000 new species are identified each year.
• B)because species are becoming extinct at a rate that is too fast to count
• C)because the system used to define what constitutes a species keeps changing
• D)because historical records are inaccurate
• E)Scientists do know. There are 1.8 million existing species on Earth

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