Are there relationships of time between subtopics?

Oceans produce approximately 80 percent of the oxygen our planet needs to support animal life. pollution that reaches the ocean through dumping, oil leaks, runoff, and other processes interferes with that oxygen production and poses a real threat to the oxygen content in our atmosphere. if the oxygen content decreases, it is likely that carbon dioxide will increase. this could have dramatic consequences for life as we know it. which does this passage indicate causes a decrease of oxygen in the atmosphere?

While you are writing, what should you do with new ideas that come into your head? a. write them down and brainstorm around them b. go back and try to find a place for them in your outline o c. just add them wherever you are in the draft d. put them out of your mind

Which of the following sentences uses a preposition properly?