What will happen in the ecosystem if there was a sudden decrease in the owl population?
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Explanation:

They are most likely limited by prey availability (and habitat loss, but let's keep it simple) if the population increased then it is likely that the population of prey species will crash after a time as the owls eat them, then leading to a resultant crash in owl population.

When there are not enough resources, the number of individuals in the population is limited. Resources that limit population growth are called limiting factors. Limiting factors prevent the population from getting too large. When the population stops growing, the ecosystem has reached its carrying capacity.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.