Which invention spurred the development of the digital camera?
a) the digital single-lens reflex (dslr)
b) the charge-coupled device
c) the analog video camera
d) the memory card

if you go to ask a question say ask, there should be something that looks like this. a camera lens.

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.