Human activities can alter an ecosystem and bring about the extinction of a species. such activities include any of these except
a. hunting a species to extinction.
b. assuring a habitat remains unaltered.
c. introducing toxic compounds into food webs.
d. introducing a new species into an environment.

Which is an accurate description of the physical characteristics of poland? its fertile soil is found only along riverbanks, and its mountainous region in the northwest has few mineral resources. it is mostly flat with fertile soil except in the east and northeast, and the mountainous region in the south has large deposits of coal and copper. it is covered with thick forests, and it has large reserves of coal, petroleum, and natural gas. its landscape is dominated by plateaus, mountains, and high ridges, and it has large deposits of sulfur and copper in the northeast.