I think that part is a mitochondrion, in which:
The process that the mitochondrion performs is that it generates energy for the cell (also known as the powerhouse of the cell).
The two raw materials the mitochondrion needs are oxygen and a precursor of some sort, whether is be sugar or carbohydrates.
The molecule generated by the mitochondrion is called ATP, or adenosine triphosphate, this molecule is important because it allows the cells to work and function, ultimately resulting in the organism being able to live.
Also btw mitochondrion is singular and mitochondria is plural.
Hope this helps!