Since 1970, the Government has moved to a management scheme that allows fire to play more of its natural role in the environment.

But there is no longer a 'natural' role for soul.

Humor plays a natural role at these events, but the association provides a structure and rules.

Meanwhile, basic researchers are trying to figure out the natural role of stem cells in maintaining the heart.

Tin has no known natural biological role in living organisms.

Under new management, Mullin played in his natural attacking role through the middle.

Human activities have affected the natural role of rivers and its communal value.

But having him back on the floor means that the rest of the Red Storm players will return to their natural roles.

That natural role of fire varies with altitude, tree species, and forest type.

This allows the part to assume its natural healthy role.