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Deep in the tropical rainforest, scientists identify a new species of mammal closely related to the Leontopithecus rosalia. The area of initial discovery is downstream from an established local tribe and appears to be the newly discovered mammals breeding site. After researching the area further, they discover that it once housed a much larger population of this particular new species of mammal.

All of the following choices are possible reasons the new mammal population could be reducing in size; however, ONE answer choice is more likely as it has the largest impact on populations.

Of the following, which is the MOST likely cause of the shrinking population size and possible endangerment of the new species?


Local tribes are expanding their territory by creating new dirt roads and clearing patches of land to build more huts in and around the species' breeding site.


An invasive species is outcompeting the new species for food.


Overhunting by the local tribes to obtain the mammal's pelt.


The local tribe upstream is polluting the river that flows through the breeding ground.


A shift in climate causing the summer months to be drier and longer, impacting the mammal's breeding season.

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