Disprove
* The scientist aimed to disprove the prevailing theory about the origin of life. (This sentence uses "disprove" to mean to prove something is false or incorrect.)
* Despite their efforts, the team was unable to disprove the existence of the mythical creature. (This sentence uses "disprove" to mean to refute or show something to be untrue.)
Disapprove
* My parents disapproved of my decision to drop out of college. (This sentence uses "disapprove" to mean to have a negative opinion of something.)
* The school board disapproved of the proposed curriculum changes. (This sentence uses "disapprove" to mean to reject or formally oppose something.)
Key difference:
* Disprove refers to proving something wrong.
* Disapprove refers to having a negative opinion or rejecting something.
Let me know if you'd like more examples or have any other questions!