![Nine years old children are taller than 7 years old ones. It is an example of](https://www.gkseries.com/blog/wp-content/uploads/2022/09/Nine-years-old-children-are-taller-than-7-years-old-ones.-It-is-an-example-of.png)
Q. Nine years old children are taller than 7 years old ones. It is an example of
- Vertical studies
- Cross-sectional studies
- Experimental studies
- Case studies
Answer: Cross-sectional studies
Q. Nine years old children are taller than 7 years old ones. It is an example of
Answer: Cross-sectional studies
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