Answer:
because they looked so alike there is no way it could have been a mistake
Explanation:
When using the perfect tenses of verbs, it's necessary to add a helping verb.
For example: I have been working on that paper for weeks.
Have and been are helping verbs, and the whole tense is called present perfect progressive.
Maybe it probally evolution theory?
It is about marrie curry a scientiet who dissoverer a element that was radioactive anr it ended killing her ahe was from the E.U european union and was one of the most highly regarded people of her time in terms of resewrch even though she was a womam