natural process
natural action
action *****
activity *****

Most of the time having a baby is a natural process.

It would be nice if the natural process took over.

What takes place in the healthy state is also a natural process.

But these things were the result of a subtle natural process.

To us a natural process that was discovered in modern times.

That natural process no longer occurs in the same way.

Then she, too, stopped the natural process with firm fingers.

"Change is a natural process for an institution that wants to move forward," he said.

Scientists start to wonder if human activities could have an impact on natural process 3.

It would not make any sense to say that a natural process is true or false.