Which line shows the main idea of the bolded paragraph? Science has given humans many amazing devices
We know so much about our bodies and how to stay healthy
Sometimes scientists fail to find all the answers
One mystery that still remains unsolved is why we yawn

L2.4.3 test (cst): the story question 13 of 20 2 points choose the sentence that uses parallel structure correctly. o a. not only is she cutting her hair, but also coloring it. o b. he either decided to run the race or volunteer. o c. i am not only baking cookies but also brownies. od. neither my mother nor my father can watch my game.