Scientific investigations begin with a tentative explanation called what?
Scientific investigations begin with a hypothesis. This is a prediction based on an idea or theory
The explanation is called a theory. A tentative explanation would be a theory that has not been tested completely. A theory makes predictions about what should happen.
Scientific investigations begin with a hypothesis or prediction about what will happen based on the ideas contained in a theory. Good theories make good predictions. Theories that make repetitively make good prediction become accepted theories and eventually regarded as being true. Theories that make bad predictions would be replaced by new theories.