Which characteristic of life is the most important in determining which item (plant or car) is alive

Growth, excretion, energy, reproduce

Explanation:

A plant has the ability to makes it own food via photosynthesis unlike cars (they arent living because they don't have growth and reproduce)

not sure if this what   you'r looking for would be percent composition

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.