which phrase is most likely to start a description of a scientific theory?\n“ what i have found through my…

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

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

Answer

Brief Explanations:

A scientific theory is based on extensive observations and experiments. The first option relies on online - research which may not be reliable scientific evidence. The second option is a personal belief without scientific basis. The fourth option is a hypothesis, not a theory. The third option mentions observations and experiments over a long period, which is characteristic of the basis for a scientific theory.

Answer:

"Based on the observations made and experiments performed over the last fifty years . . ."