Answer:
a. longitudinal
Explanation:
A longitudinal study examines a given group over a long period of time, so collecting data from the same group of 30 people over their lifetime certainly fits that definition. It's more like an evolution study.
A cross-sectional compares different groups at the same point in time. So, it's more like a survey.
A microgenetic is much focused in time, providing multiple data sets in a short time to examine rapid evolution of a subject.
An experimental study design will make interactions and experiments with the study group, while this is not the case here apparently, and experimental is usually for a much shorter period than a generation.
I am involved with a community garden and an interactionist might like to study our organization. We have some very knowledgeable people like ex soil scientist's to guide us and we believe in thoro ugh discussion of our plans for work in the garden and encourage everyone to participate and our work is very co-operative and we love what we are doing because it is for the benefit of all of us plus the wider community who can grow vegetables in our garden. Therefore our truly democratic and giving model could be studied for benefit.
Answer:
mass and volume.thank you
