Which molecule shown in the animation, the square or the circle, is moving against its concentration gradient? which molecule shown in the animation, the square or the circle, is moving against its concentration gradient? the circle the square both the circle and the square neither; they are both moving with their respective concentration gradients?

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.