What is the primary means for degradation of soluble fibers in the large intestines?

The soluble fibers are degraded in the large intestine by the means of the bacterial enzymes. The bacteria present in the large intestine secretes enzymes that helps in the degradation of the many soluble fibers which are not digested in the stomach and the small intestine. The bacteria present in the large intestine of the humans include the Lactobacillus, E. coli, Clostridium, Enterococcus and many more.

Hence, the answer is 'bacterial enzymes'.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.