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.
Answer: C
. Supply of soybeans will increase and the supply of corn will decrease
Explanation:
Soybean fertilizer is an integral input in the farming of soybean so with the price of soybean fertilizer decreasing, it will be cheaper to grow soybean as opposed to corn.
Farmers will therefore farm more soybeans than corn to benefit from this lower cost and so will farm less of corn as they can only farm one at a time. This will lead to an increased supply of soybean and a reduced supply of corn.
