"Research suggests that Mars has some features that would support life, but most conditions are too harsh for it." is <span>definitely</span> a main idea as for the second one your best bet is to talk about possible life on mars in the future so that 4th sentence is going to be your friend.
Sample Response: James Baldwin speeds up the action to create suspense for the reader. By moving the action forward so quickly, the author leaves the reader anxious to discover if Theseus saves himself and the other characters from the Minotaur.
