What is the central idea of the passage? (passage is an excerpt from The Unicorn of the Sea by the National Oceanic and Atmosphere Administration) a. whales are difficult to study because they are found in waters that are difficult to reach and covered in ice.
b. the narwhal has a single tooth, outside of its mouth, unlike other marine mammals, who have many teeth.
c. whales, such as the narwhal, that inhabit Arctic waters feed mainly during the spring and summer months.
d. the narwhal is a deep-water diving marine mammal with a single tooth, or tusk, for which it is best known.

Sui

Explanation:

Almost every character who dies in the three Theban plays does so at his or her own hand (or own will, as is the case in ). Jocasta hangs herself in  and Antigone hangs herself in  Eurydice and Haemon stab themselves at the end of  Oedipus inflicts horrible violence on himself at the end of his first play, and willingly goes to his own mysterious death at the end of his second. Polynices and Eteocles die in battle with one another, and it could be argued that Polynices’ death at least is self-inflicted in that he has heard his father’s curse and knows that his cause is doomed. Incest motivates or indirectly brings about all of the deaths in these plays.