Which statement is true about the part of the electromagnetic spectrum that is divided into seven ranges of wavelengths? a. it is the only part visible to the human eye. b. it is one of the three parts visible to the human eye. c. it cannot be seen by the human eye unless it rains. d. it is one of the two parts visible to the human eye.

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.