Which of these statements apply to scientific theories? They are widely accepted explanations of natural phenomenon that have been extensively tested They are collections of speculative and yet untested ideas about natural phenomenon. They are absolute proofs of a scientific explanation obtained after rigorous testing. They are open to further study and can be revised pending new evidence. They are the highest level of certainty a scientific explanation can attain.

They are widely accepted explanations of natural phenomenon that have been extensively tested

Explanation:

Scientific theory is a widely accepted broad explanation of a natural phenomenon that is supported by large body of evidence. The explanations and findings have been extensively tested and widely accepted. Any scientific theory starts as a hypothesis. Hypothesis is an idea that has not been proven yet.  The next step is becoming a theory after the hypothesis has proven to be a valid explanation for a particular phenomenon.

Scientific theory are usually very explanative, concise , systematic and broadly applicable. The theory have been tested over and over again and found never to be wrong. Theory can be modified or improved overtime as more information is been gathered.  

Theories are widely accepted explanations of a natural phenomenon that has been extensively tested.