Both petroleum and coal are made up of complex carbon-based molecules, and both originated with living creatures of some kind. both are vital sources of energy for the modern world and both were formed by geologic processes over millions of years. however, petroleum was mainly formed from the remains of ocean-dwelling microorganisms. coal, on the other hand, originated from decayed vegetation in ancient swamps and bogs. in any case, it took millions of years for both coal and oil to be produced. this is the case because it took that much time for overlying sediments to produce the unimaginable heat and pressure that would one day allow us to harvest these energy resources.
what is one clue word or phrase in the passage that indicates a contrast?
a. however
b. in any case
c. both
d. because

Drag the tiles to the correct boxes to complete the pairs. match each paragraph to its corresponding purpose. tiles: instructs describes persuades narrates pairs before you purchase a used car from a dealer or an individual, there are important steps you must take. first, examine the car using an inspection checklist, which you can download and print from many websites. then test-drive the car under a variety of road conditions, making sure that it handles well in many situations. finally, ask for the car’s maintenance report and make sure you understand any repairs made on the car. arrowboth "good morning, sal! " uncle freddie said. " for coming in so early today." uncle freddie danced as he spoke. sal yawned. he did not know how his uncle woke up so cheerfully before dawn every day. uncle freddie placed a tray of cookies in front of sal. "i need you to decorate these," he said. he handed sal several tubes of icing. arrowboth the hole created by the meteorite's impact, known as the barringer meteorite crater, can still be seen today. it is one mile wide and over 550 feet deep—20 football games could be played at the same time on its floor, and more than two million people could watch from its sloping sides. arrowboth you know the feeling: it’s minutes until the school bus comes, but you just rolled out of bed, threw on some clothes, barely brushed your teeth, and now you’re racing out the door to catch the bus. you skip breakfast again. that’s three days this week alone! it’s no wonder, then, that by second period you start to feel awful, with your stomach grumbling and your eyelids drooping. my fellow classmates, listen up! you may be surprised by how a few simple changes in your life can have a huge effect on how you feel morning, noon, and night! arrowboth