At extremely high temperatures (e. g., millions of degrees), which of the following best describes the phase of matter?
a. a gas of rapidly moving molecules
b. a plasma consisting of rapidly moving, neutral atoms
c. a plasma consisting of positively charged ions and free electrons
d. a gas consisting of individual, neutral atoms, but no molecules

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.