The condition or progress of a reaction is represented by reaction arrows. The chemical reaction arrow is a single straight arrow that points from the reactant(s) to the product(s) and by-products, as well as side products.
I think this should help you find the answer more easy!
"<span>using shaving cream, rather than shaving on dry skin" I believe this is the answer. coz rest of them would increase friction rather than decrease</span>
That is true because a hypothesis is like a conclusion, a thinking of what could happen
O Sounds like the best answer
