C ........................
helium is an element..............
The first two blanks are evidence of climate change, third blank is the main cause of climate change, and the fourth blank is a mechanism by which climate change occurs.
Answer:
Mechanical digestion involves physically breaking down food substances into smaller particles to more efficiently undergo chemical digestion. The role of chemical digestion is to further degrade the molecular structure of the ingested compounds by digestive enzymes into a form that is absorbable into the bloodstream.