They are both important because mechanical has to do with physical - cause mechanical means physical, so chewing your mouth is physical (you break your food into smaller pieces physically). And then chemical digestion is when food and saliva mix together. They happen when breaking down food into nutrients - enzymes. Enzymes are important for that process, because they make a nutrient.
Hope this helps!!
If your body has developed a tolerance to a medication you're taking, it means the medication at your current dose has stopped working as effectively as it once did. It might mean your body becomes used to the medication, and you don't get the same benefits or effects as before. Drug tolerance is indicative of drug use but is not necessarily associated with drug dependence or addiction. The process of tolerance development is reversible and can involve both physiological factors and psychological factors.
Photosynthesis, in the chloroplasts of the cells
