Answer:
A theory changing because a new scientific method was developed.
Step-by-step explanation:
Scientists before Mendel did experiments that resulted in the theory that organisms acquired traces of their environment and passed them on to their offspring. However, Mendel established a different scientific method that developed experiments that showed that this theory was wrong. Mendel developed a new theory which, based on his experiments, stated that the traits passed on to the offspring were the result of genes being transmitted from parents to their offspring.
With this, we can say that this is an example of a theory that changed because a new scientific method was developed.