They do this by exchanging materials and information with their environment.

The band members also don't work all together, but rather in small groups, exchanging material they record with others.

'You are thinking, yes, we can exchange necessary materials with the outside world, and this is true,' she went on.

They are always changing, because they exchange materials and information with their environment.

But these layers are also always shifting position among themselves, exchanging material.

Both libraries have a borrowing agreement allowing them to exchange materials.

During these festivities they would exchange cultural objects and materials for tools".

But the music and movie companies, pledging to appeal the decision, said the two services were overwhelmingly used by people to exchange copyrighted material.

Perhaps his fans have never had it so good, for technology makes it possible to exchange even book-length material with ease.

Some bacterial populations are asexual: no means of exchanging genetic material exists.