Which phrase is most likely to start a description of a scientific theory? “what i have found through my online research is . .” “after much thought, i believe that the best explanation is . .” “based on the observations made and experiments performed over the last fifty years . .” “if sunlight shines on the right side of a plant, then the plant will grow toward the right because . .”

Based on the observations I made.

Answer

The phrase most likely to start a description of scientific theory is, “Based  on the observations made and experiments performed over the last fifty years”

Explanation

A scientific description is based on systematic observations and detailed explanation of a phenomenon in science in a way that it could be replicated. Other lines of evidence are normally added in a scientific description to develop working hypothesis. An explanatory theory according to the observation and evidence is then developed.