Question

The eastern gray squirrel is an invasive species in Europe, where it typically outcompetes the native red squirrel. The graph below shows the population of red squirrels in an 125-acre forest in Europe before and after the introduction of the eastern gray squirrel.


Eastern gray squirrels were most likely introduced to the forest in 
a. 1975//b.2010//c.2000//d.1985.

Pine martens, a type of weasel, are a native predator of squirrels in Europe. Red squirrels have evolved adaptations against pine martens, but eastern gray squirrels lack such adaptations. Efforts to increase the population of pine martens in the forest most likely began in 
a.1985//b.2000//c.2010//d.1975.


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Answer 1

Eastern grey squirrels were most likely introduced in 1975 because that's when the data starts to decrease.

Efforts to increase the pine marten population probably began around the year 2000, that's when the red squirrel population started to increase again.

Answer 2

Invasive species are a threat to the native species that attack the prey and negatively affect the ecosystem.

In the graph below:

(a) The introduction of invasive species can be seen in the year 1975. It can be seen that the population of red squirrels significantly decreased in the years 1975 to 1980.

(b) Also, the pine martens are the natural predators of the grey squirrels, whose population became to decline in the year 2000. The red squirrels have adapted to the predators, and their population can be seen increasing in the year 2000.

To know more about invasive species, refer to the following link:

https://brainly.com/question/21452505