Question

which best explains how and why scientific knowledge is continually expanded and improved?
the scientific process flows in one direction and finds only facts that support a scientist’s original idea.
the scientific process is cyclical so that new facts inspire questions that lead to new studies.
once explanations are found to be true, they do not need to be questioned; then scientists can stop studying the
topic.
once facts are found through experiments and observations, other scientists do not need to repeat the
experiments.

Explanation:

The scientific method is iterative: new observations or data raise new questions, prompting further research that expands and refines existing knowledge. The other options are incorrect because the scientific process is not one-directional, scientific explanations are always open to re-evaluation, and replicating experiments is a key part of validating scientific facts.

Answer:

The scientific process is cyclical so that new facts inspire questions that lead to new studies.