2.) Malaria!
3.) Ozone Layer! (:
Hope this helps and everything is well! (:
Answer:

Explanation:
Total distance of one lap of the marathon = 42.2 km
Distance of the lap that is inside the stadium = 400 m
The distance that is run outside the stadium is the difference between the two distances

The distance that is run on the road outside is
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Stimulants are often called "uppers".
This is how vaccines are used. You introduce the antibodies in a vaccine so the person builds up an immunity and never develops the disease