Because many animals are likely to die from contamination
Altitude is height above sea level. The density of air decreases with height. There are two reasons, at higher altitudes there is less air pushing down from above,and gravity is weaker farther from earths center.
10 is mixture of elements and compounds
11 is compound
12-15 are mixture of compounds
<span>2H2 + O2 mc015-1.jpg 2H2O
</span><span>26.70 moles</span>
