The organelle is Mitochondria, the easiest way to identify this organelle is by the shape in which the diagram shows the inside of the organelle. Usually, Mitochondria has insides which look somewhat like a maze. To identify a Mitochondria without an image, it’s extremely important to remember that this is the powerhouse of the entire cell, which produces ATP for cellular respiration. Hope that helps, if you have any more questions feel free to message me. Thanks.