The aphid is then eaten from the inside. But sometimes another wasp finds the parasitized aphid and lays its eggs into the wasp larva body. So a parasite is being parasitized by another parasite. Seems as though we know a lot about these critters. Well, we do and we don't.
Some insects have a long juvenile stage and a brief adulthood.
They spend maybe 13 years underground feeding on tree roots, then when they're the right size and age, in unison they all crawl out of the ground, affix themselves to the bark of trees, split out of their skin and emerge as an adult. Within the next two days, they mate and die. Many people loved bugs when they were children but no more. The big thing is that little kids have an unbounded interest. They're fascinated by almost everything equally.