The two details which <em>refines </em>the author's claim that the <em>materials used for the design of shoes</em> has evolved over time are where he mentions that there has been a change from the material used to make the shoes to more durable and resistant material.
According to the given question, we are asked to state the two details which <em>refines </em>the author's claim that the <em>materials used for the design of shoes</em> has evolved over time
As a result of this, we can see that from the given excerpt, there is the mention that human feet has evolved and <em>has become bigger</em> than they once were and this has led to the new materials which would <em>make the shoes </em>more durable and able to last longer.
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Answer:
What is an Essay Conclusion? Conclusion definition is simple: It's the last paragraph of your essay or any other college pager, summarizing its thesis and arguments. It helps readers see why your essay should matter to them
A school debate would be an example of a formal discussion.