Second, several factors such as habitat loss, hunting pressure, competition with other native species and non-native species, and contaminants are simultaneously affecting species' population size and distribution along with climate change so that it is difficult to determine definitively the effect of any one cause.
(several factors such as habitat loss, hunting pressure, competition with other native species and non-native species, and contaminants; are affecting; species' population size and distribution along with climate change; T:simultaneously)
several factors such as habitat loss, hunting pressure, competition with other native species and non-native species, and contaminants
are affecting
species' population size and distribution along with climate change T:simultaneously