The graph shows the changes in the population size of a mammal species introduced onto an isolated island in 1957. Changes in Population Size 800 700 600 500 Number of Individuals 400 300 200 100 0 1955 1960 1965 1970 1975 1995 1980 1985 1990 2000 Year Which of the following conclusions is best supported by the data? (1 point) A predator of this mammal was removed from the island in 1990 . In the 1980s , the mammal's population size stayed around its carrying capacity The population decreases were the result of low immigration rates.
The best supported conclusion by the data is that in the 1980s, the mammal's population size stayed around its carrying capacity.
From the graph, we can observe that the population fluctuates around the 600-700 range between 1980 and 1990. This indicates that the population size remained relatively stable during this period and did not significantly increase or decrease.
There is no evidence in the graph to support the conclusions that a predator was removed from the island in 1990 or that the population decreases were the result of low immigration rates.