The next section presents two planets and ecosystems imagined by scientists.

As we followed Scott up, each vertical section presented new challenges.

This section presents an analysis of the model with 2 firms and constant marginal cost.

The first section presents a critical review of traditional library catalogue use studies.

This section presents some of the more common delivery technologies that have been important to historic energy development.

This section presents a few of the most common formulae.

This section presents a short list of the most often used tasks.

The following section presents some of the major studies on this topic.

This section has just presented some statistical data on such differences.

Once again a long section of empty tunnel presented itself to his irate view.