Question

question 3
which phrase is most similar in meaning to \scientific theory\?
an opinion of what should happen
a mathematical relationship
a rigorously tested explanation
a best - guess explanation
question 4
which option describes scientists systematic approach to learning about the natural world?
hypothesis
scientific method
observation
empirical evidence

Explanation:

For Question 3, a scientific theory is a well - tested and well - substantiated explanation. For Question 4, the scientific method is the systematic approach scientists use to learn about the natural world.

Answer:

Question 3: a rigorously tested explanation
Question 4: scientific method