CAN SOMEONE HELP ME PLEASE NO COPYING AND PASTING TOPIC: HOW ARE THE EARTHS STRUCTURE CHANGE OVER TIME

Why does the author follow up on the story of martin torres near the end of the article? what important ideas does this part of the article support?

If a sentence is a run-on, correct it. if it is correct as written, write correct. 1.)i looked down. i saw that the well was apparently dry. 2.)we read the preamble to the constitution, our group felt anew the power of those words. 3.)the boy had trouble with the decimal point when multiplying he always put it in the wrong place. 4.)the thermometer broke, the mercury spilled onto the floor. 5.)i mislead my car keys, my house keys were also gone. 6.)it is against the law litter, neveretheless, people do it. 7.)ann threw away the check, but she eventually recovered it. 8.)i generally like the climate of the area where i live i do not enjoy subfrezzing winter temperatures. 9.)everyone should be polite, however many people are rude. 10.)i made my own chili to eat it one needs an iron stomach.

Dogs make wonderful pets because they us stay happy and healthy. the topic sentence is "dogs make wonderful pets." , is this correct? i keep doubting myself.