where is the diagram?
without the diagram i can't help
Answer:
plutonium
Explanation:
Since the mass of plutonium is higher than any other one on the chart this means it can withstand more pressure such as being used in architecture
the answer is temperature
The major limitation is that C) he can not definitively show what causes the difference.
It may be caused by <em>something the people are doing</em> (if so, what?) or it may be caused by <em>some environmental differences</em> or a<em> combination of both</em>.