Answer:
In the second picture, the answer is A to attach to a host cell.
In the third, the fourth and the fifth the answer is D.
Explanation:

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How the Scientific Method Works
BY WILLIAM HARRIS
Pasteur's Experiment
The steps of Pasteur's experiment are outlined below:
First, Pasteur prepared a nutrient broth similar to the broth one would use in soup.
certain hydrogen bonds are formed so that A goes with T and G with C
