The answer is mitochondrion. Mitochondria are critical for the cell’s biochemical processes that require energy to be powered. Mitochondria are responsible for generating this power in the form of ATP through a process called chemiosmosis. Without ATP, the cell would immediately die since it would be incapable of performing virtually all biochemical processes that re required to sustain life.
To show he presence of a trait you would need to follow it through multiple generations in a pedigree.
Chloroplasts help them detect light. Chloroplasts are also contained in plants.
