cause
That's not just a "belief", that's what has been observed.
Theories are ideas, educatied ideas, but still only ideas. A scientist may change a scientific theory if new facts or information are found, if other scientists' review find errors, if attempts to apply the theory are unsuccessful, or if they see that the calculations are wrong when they double check them, and so then they would retest and rewrite their theory to correct the errors.Science is testing a belief with the means to disprove it and being unable to do so.Scientific Fact = something that has yet to be disproved.
scientist might concluded that the snakes budding
A scientist forms hypothesis to better conduct an experiment. He or she asks a question, then forms a hypothesis, or prediction, so that they are better prepared for a likely outcome of their experiment. If they don't try to guess what might happen, they might not come prepared and could be injured or unsucessful in their collection of data.
It could be the result of better information, a new model or both. Alternatively, the scientist might be modelling different scenarios.
When the scientist is trying to represent an object or a system.
There are various reasons. Here are some:They might be skeptical of the reliability or truth of what other scientists have claimed.They might be trying to understand the earlier results better.They might be hoping to extend the other scientist's results.They might be trying to determine whether there are limits to the applicability of the other scientist's results.
New technology come out so thy could prove another point
A scientist might use a model as a research method for a few reasons. This model could tell the scientist how something moves for example.
there might not be enough proof
You would call such a belief a heresy. Depending on the nature of the belief, it might also be called blasphemy.
Why do scientists believe there might be water on the Moon?