Question

order the topics from broadest to narrowest.
broader
the effects of a high-fat diet on the aortic valve
the effects of a high-fat diet on the cardiovascular system
the effects of a high-fat diet on the human heart
the effects of a high-fat diet on the human body

Explanation:

Broadest topics cover the largest scope, narrowing down to specific parts of the body. Start with the entire human body, then the cardiovascular system (a body system), then the heart (an organ in that system), then the aortic valve (a specific part of the heart).

Answer:

1. the effects of a high-fat diet on the human body
2. the effects of a high-fat diet on the cardiovascular system
3. the effects of a high-fat diet on the human heart
4. the effects of a high-fat diet on the aortic valve