What does a key signature tell a musician?

the length of time a note should be held

how fast a song should be played

what notes should be sharp or flat throughout a song

how high or low to play the notes

What notes should be flat or sharp throughout the song.

Hope this helped!

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites