What is the purpose of the lines that are underlined?

These are answers to topic questions, and the paragraphs after them explain the answers.
These are summary points so that the reader could just read these lines and understand the passage.
These are conclusions that summarize all of the information in the paragraphs before them.
These are headings that give titles to the topics being discussed in the paragraphs after them.

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.

Read the excerpt from it's our world, too! : young people who are making a difference. the author’s purpose in this excerpt is to

We must understand the connections between the climate crisis and the afflictions of poverty, hunger, hiv-aids, and other pandemics. as these problems are linked, so too must be their solutions. we must begin by making the common rescue of the global environment the central organizing principle of the world community. which statement best describes gore's use of evidence to support his argument? a. gore makes connections between events to support his argument that solutions to the climate crisis will also solve other problems. b. gore provides dramatic details to support his argument that solutions to problems of this magnitude are often rare. c. gore compares crises in the world to support his argument that the problem of climate change must take a backseat to other problems. d. gore describes positive outcomes to support his argument that people should remain optimistic about finding solutions to climate change.