Which data could most likely be accurately replicated by other scientists? determining the health of a mouse based on its appearance determining the distance between trees in steps calculating the length of chicken eggs in millimeters reporting the height of horses in hands?

Here the major part concerns the question: which method is the most reliable and applicable?

And the answer is: calculating the length of chicken eggs in millimeters

This is because millimeters are internationally accepted measure with a Standard, which means that everyone who measures in (mili) meters uses the same measure: and this measurement can be repeated.