The order of adoption may also cause significant differences in their relationship.

The game uses a day/night system, causing differences in enemies.

These differences are caused by a mix of cultural and institutional factors.

From this followed the key discovery of what causes differences in tone color.

This difference can be caused by different degradation rates at higher temperatures.

Other authorities do not divide the species and suggest any physical differences are caused by the local environment.

The difference in gas prices is caused largely by pipelines.

As to whether the observed differences in behavior are "caused" by day care, have the researchers considered selection effects?

A second position is that differences in average cognitive ability between races are caused entirely by social and/or environmental factors.

This forces researchers to question what causes regional differences in voting outcomes.