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 . .”

The correct answer will be option- “If sunlight shines on the right side of a plant, then the plant will grow toward the right because . . .”

Explanation:

A scientific theory is a well-substantiated idea which provides a deep explanation of any natural phenomenon.

A theory is not based on any personal opinion and belief system but formed when many scientific system support it by providing evidence. A scientific theory is accepted only after it has been proved and tested by the experimenter and the scientific fellows. The theory explains the natural phenomenon in depth.

In the given question, since option which starts with "If sunlight...because" clearly states that it has explained the proposed hypothesis which started with "If and because" therefore the selected option is the correct answer.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =