Scientific theories can be modified and in some cases completely scrapped based upon new research.
How do scientific theories develop and change?
Theories change because more/different information is discovered.
no
recurring-phase theories and sequential-stage theories
Because our society develops and further testing can disprove theories.
Yes
As more and more data is collected and evaluated on a topic, scientists' theories or hypothesis may change based on the new information.
There is no such thing as a "scientic theory".
Do Lamarck's theories provide a good explanation for the change in months? Why or why not?
Yes, they can, if new evidence is discovered to support a change in the theory. Physical theories are not provable in the sense of mathematical theorems. They depend on evidence, and they can be disproved if enough contrary evidence comes up.
they can change over time
Because society changes over time.