It is only vehicles? Or can it be other things too. But trains also require a ticket.
C - prey
i - predator
a - parasitism
f - commensalism
d - competition
Answer:
meta-analysis
Explanation:
Meta-analysis involves the statistical procedure of combining data and results from multiple studies and trying to determine or draw relevant conclusions from here.
From the example above, Dr. DiLorenzo combines results from a number of studies of same topic to investigate the relationship between two variables. He is doing a meta-analysis.
