A family raises a species of fish in a pond. At the end of each summer the family sells the fully grown fish. One year, the family notices that the fish are smaller than they have in the previous year. Which statement best describes this observation.
There was less food available in the pond this year than last year
There were fewer fish this year than there were last year
There was more space in the pond this year than last year
The type of fish in the pond this year tended to be smaller than the type of fish last year