Which of the following is a criteria for evaluating the validity of a source for a research project?A)Author's professional background B)Author's publication history
C)Country of the author's origins
D)Number of times it has been cited

B), Author’s publication history

Explanation: It cannot be C) because the country an Author is born it does not affect their validity, and it cannot be D) because it is possible for a source to be cited many times but still be invalid.

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !

ed brushes his teeth

explanation: