Land, fresh water, air, and heavy metals.
Answer:
D. presidential democracy
Explanation:
<em>Answer:</em>
<em>astigmatism </em><em> </em>
<em>Explanation:</em>
<em><u>Astigmatism</u></em><em> is described as one of the common conditions associated with an eye that leads to developing blurred vision in a person. Astigmatism generally occurs when an individual's cornea i.e, the eye's front cover is being irregularly shaped or at times due to the lens curvature present inside his or her eye. Astigmatism can cause distorted, blurry, or fuzzy vision. </em>
<em><u>As per the question, Nigel is exhibiting symptoms of astigmatism.</u></em>
The silk road was a major trade route during that time
hope this helps
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