The answer is water. It is mainly absorbed in the ileum and re absorbed in the colon. But note that not all water you take in is absorbed, as the faeces is wet.
Consequences of the widespread use of plastic materials can be an increase in levels pollution and the overflowing of landfills because most plastics are non-biodegradable and can take a very long time to disappear unlike things like paper which are biodegradable.
