EQ: What is the scientific Method and
how do we use it in our everyday lives?

The scientific method :

Make an observation.

Ask a question.

Form a hypothesis, or testable explanation.

Make a prediction based on the hypothesis.

Test the prediction.

Iterate: use the results to make new hypotheses or prediction

Explanation

that's the scientific method but there are many example to how you use it in everyday life i.e the lights went out and you want to find out why, perhaps you didn't pay your bill or maybe the power went out.  then you would go through the steps to find out what happened

the answer to your question is:

c. complementary base-pairing

not sure if this is what you'r looking for eubacteria and archaebacteria