Some of the longirostrine forms, however, do appear to form a natural group.

These species are then divided into two natural, genetically isolated groups.

It has been shown that the genus does not form a natural group.

This is a technique for dividing data into natural groups.

Individuals in the first, 'natural' group learned the words twice as quickly and retained them longer.

This means that loculoascomycetes did not constitute a natural group.

He learned that they were divided into eight natural groups.

In the work, he introduced definitions of natural groups among invertebrates.

Individuals without natural organic local groups are defenseless and more likely to be caught up in a social current.

Finally, we shall tell them that there is no way of having true brotherhood except within those natural groups, the family, the town, the homeland.