The 4 clues are 1) color change 2) the formation of gas bubbles 3) formation of a precipitate 4) temperature change. I hope this helps
People can make the best use of ideas,opinions, nature to create more resources when they have the knowledge skill and technology to do so.this is why people are a resource it is the ability of humans to help in transferring a physically material into a valuable resource at any given notice.
James Buchanan served his entire presidency as a bachelor.
