Studying the same group of individuals from age 2 to age 40 is an example of which of the following research methods?
a. cross-sectional
b. longitudinal
c. archival
d. none of the above

a. Cross sectional

Explanation:

Longitudinal research is a method in with data is recollected repeatedly over a period of time from the same subjects. Archival method is gathering information from archival records. Cross-sectional studies analyze data from a population at a specific period of time, this population can be integrated by people with different characteristics (in this case, age) but with another characteristics in common, for example, ethnicity, gender, etc)

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answer; i believe the correct answer is (sporophyte);