Structure I hope is the right answer
.Africa
<span>2.Afghanistian </span>
<span>3.Russia </span>
<span>4.Mediterranean</span>
<span>Radon may cause lung cancer when inhaled.
a: is formed by the breakdown of the ozone layer
b: may cause lung cancer when inhaled
c: binds with hemoglobin, preventing binding with oxygen
d: contributes to the breakdown of the ozone layer
e: in the atmosphere limits the availability of sunlight for plants</span>