The answer is; a) they are naturally occurring.
This process is called autophagy.
Autophagy is an intracellular process of degradation, which includes the destruction of cytoplasmic components in the lysosomes. These components are considered unnecessary or dysfunctional and that is why they are recycled by the cell.
Autophagy has four sequential steps which are the sequestration, the transport of the components to the lysosome, the degradation, and the recycling and utilization of the degradation products.
Autophagy is considered as an adaptive response to stress by ensuring the survival of the cell and the tissue.
I would say the answer is filters. They are responsible for showing entries that contain certain values according to the category you choose. For instance, you sort out the data by the date, when you choose from the filter list a certain date like jan 1, the sheet will be changed and will only show data for jan 1.
Chyme is actually produced both in the stomach and the small and large intestines of the digestive tract. This thick semifluid mass or digestive juice is responsible for breaking down the food and making it easily passable into the intestinal walls. Chyme is also responsible in preventing the gastric juices of the stomach to attach its own and within the intestines it breaks down food into proteins, starches, and fibers.
The enzyme maltase breaks down disaccharide maltose into simple sugar glucose, which is usable by the body. This glucose can now also be stored in the liver for future use.
This maltase does nor break down sugar sucrose because it is the sucrase enzyme that breaks down sucrose into glucose and fructose.