Answer:
Explicit – clearly stated so there is no room for confusion or questions. Implicit – implied or suggested, but not clearly stated.
A man (or a human to be politically correct). In Greek mythology, a monster in the city of Thebes called the Sphinx would ask this question to any passerby and if they couldn't answer it correctly, the Sphinx would eat him/her. In the morning, the man is a baby and he crawls on fours. In the afternoon, a man is grown and walks on two feet. In the evening, the man is old and requires a cane to walk. The man who solved this riddle was Oedipus who, upon solving it, caused the Sphinx to fling herself off a cliff and commit suicide.
You can use the (Unique) constraint to compare one column against another column. Hope I got it right.
A. He hopes that the president will take immediate action to curb segregation laws at the federal level.
Hope this helps :)
