Determining a person's age (in years) would involve measurement on a(n) scale of measurement.

Explanation:

The levels of measurement include: Nominal, ordinal, interval and ratio.

Nominal is used for classifications, like gender, nationalities or language.

Ordinal is used for comparisons, it has some rank order.

Interval is to express a degree of difference.

Ratio is magnitude, amount of something, and zero doesn't have a specific meaning.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.