Excessive bleeding from an injury could be due to the lack of vitamin

The diagram above is an illustration of a cell carrying out a biological process. Study it and answer the question below:

The process is referred to as 

The diagram above is an illustration of a system in humans. Study it and answer the question below.

Enzymatic digestion of protein begins in the part labelled 

The diagram below is an illustration of a system in humans. Study it and answer the question below.

The parts that secret substances involved in the digestion of fats are labelled

If the small intestine of an organism does not have villi, the organism will have a problem with