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!!
B is not one of the three domains of life
Conserve hot water.. check on the heating system and the water heater..
<span>Time period refers to as how much a certain thing took to complete one cycle</span>
