The main channel of the river speeds up. Basically, as the river floods, the cross sectional area of the river increases, eventually flooding the areas adjacent to the main channel. While these move slower than the main channel, they a still moving faster than they did before.

While gravity and mass of water produce the flow, friction with the riverbed slow it down. Thus, deeper channels move faster. As they deepen, they speed up.

A mule has 32 horse chromosomes and 31 donkey chromosomes. A total of 63 chromosomes. Normally, an organism would have two copies of one chromosome, one from the mother and the other from the father. However, for mules, they will get two different sets of chromosomes since the mother is a horse, and the father is a donkey. These genes will not exactly be matched sets, but they are still relatively similar (enough to produce the mule offspring in the first place). To reproduce, a process called meiosis will happen, in order to get one copy of each chromosome into the sperm or egg. During this process, the chromosomes will need to “match up” to another. Unfortunately, the donkey and horse chromosome are not similar enough to pair. Additionally, the mule will also have an extra unmatched horse chromosome, so sperm or eggs are unable to be made.