Because humans have five senses: feel, see, taste, hear, and smell. When you step on a nail you basically going to feel it and you brain can sense that and it can trigger nerves which can cause pain.
Answer:
Explanation:
always change them if they have blood you dont want infections
Answer:
(1+x)(1-x)
Explanation:
Since both terms are perfect squares, factor using the difference of square formula
a^2 - b^2 = (a+b)(a-b) where a = 1 and b = x.
You would use a open stance.
