When you take photos with your smartphone or camera, the files are most likely stored on which type of storage device a. computer hard drive
b. memory stick
c. flash memory card
d. backup hard drive

Ithink it is a thermometer.

That display data that change over time

Ibelieve the answer is: b.  use a different transition for every slide to keep the audience's attentiona. that would make it boringc. sound effects might be distracting and some people might find it annoyingi hope that : )