Although some biologists suggested as far back as the mid-19th century that water channels might exist, most were dubious because none had ever been found.

Some biologists have suggested that each should not be considered a single organism, and that the tapeworm is actually a colony of proglottids.

However, some biologists suggest that the structure more closely resembles a club.

Evolutionary biologists suggest that strict adherence to provenance collecting is not a wise decision because:

Some biologists suggest that the best solution to the crown of thorns 'problem' may be to do nothing - except, of course, to monitor the situation.

Some marine biologists have suggested that the craft be restricted to deeper waters.

"It is a simple matter to escape from this house," suggested the biologist.

In fact, many evolutionary biologists have been suggesting exactly this for some time.

Evolutionary biologists suggest that the genus Homo arose in East Africa approximately 2.5 million years ago.

Some biologists, Richard Dawkins in particular, have suggested that the gene is the object of selection.