How does the following sentence fit into the paragraph about humpback whales? Humpback whales, voyagers of the sea, live in oceans around the world.

it is a supporting detail
it is a trivial detail
it is a main idea
it is a concluding idea

How is president obama using an appeal to reason, or logos, in this excerpt? by explaining why each person must work hard in order to succeed by explaining why working together is necessary for success by explaining why attempts at working together in the past failed by explaining why each person must look out for him or her self