Gravity. it pulls things down to the earth so it makes it easier to go where the gravity is pulling
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.
There are 3 sources of calories (or energy), which are also known as macronutrients: carbohydrates, protein, and fat. Of these three, carbohydrates are the body's preferred source of energy. Carbohydrates break down into glucose, which is an immediate source of energy especially for the brain and muscles.
On the seventh day of the menstural cycle (proliferation phase).
Answer:
Thin walls easily allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood cells and the surrounding tissue better.
Explanation: