Assimilation is taking place in the liver or any other cell. â¢ In absorption, nutrients are added to the blood stream or lymph, but in assimilation, nutrients are taken out from the blood stream/ lymph. Related posts: 1  Difference Between Mechanical Digestion and Chemical Digestion.
Why Bottled Water Has an Expiration Date. Bottled water may carry an expiration date, but under typical storage conditions it does not go bad. It can grow algae and absorb chemicals from its container that make it taste bad. GNL Media / Getty Images.
Unopened it' can be good for up to two years. However, opened is another matter. Although bottled water is tested that does not mean it is contaminant free. Bacteria can still be present. After opening if you keep it refrigerated it should be ok for up to two weeks.