Because each part does a unique step in the system. An example would be that the mouth and stomach breakdown the food, but the small and large intestine absorb nutrients and water into the bloodstream.
The answer is all of these
Hey there!
The skin and nervous tissues develop from the ectoderm.
The ultimate goal of energy metabolism is produce the compound called ATP.
<h3>What is ATP?</h3>
This is known as Adenosine triphosphate and it is referred to as the energy currency of the cell.
It is formed during energy metabolism from energy-yielding nutrients such as carbohydrates etc which was why it was chosen as the most appropriate choice.
Read more about ATP here brainly.com/question/897553
