December 2017
Beginner
412 pages
10h 8m
English
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(Photo credit: NASA/Goddard Space Flight Center Scientific Visualization Studio)
Take a look at the pictures above. The first one shows forest cover in the Amazon basin in 1975. The second one shows the same area twenty-six years later. Anyone can see that much of the rainforest has been destroyed, but how much is “much”?
Now look at this:

(Photo credit: CDC) |
Are these blood cells healthy? Do any of them show ...
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