Does the model below represent a mixture or a substance ?

where's the model? I think you forgot to put the picture (◍•ᴗ•◍)

lancelot said to the beautiful ellen i c u r a b u t l n (i see you are a beauty lancelot was the greatest and worst of the knights who became the king's champion and undertook quests in the king's name. he became the adulterous lover of queen guinevere, and they had a son named galahad.

here is a link that will you.