What is the subject in this simple sentence?
marsupials are an interesting group of mammals.
a. marsupials
b. are
c. mammals
d. group

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