Half of the answer involves environmental differences: geography deals worse cards to some societies than to others.

There, however, key environmental differences which have a bearing on moons as potential sites for extraterrestrial life.

In addition, environmental and genetic differences between patients can complicate analysis.

Due to the environmental differences at high altitude, it may be necessary to decrease the intensity of workouts.

Those differing outcomes are clearly related to environmental differences among the colonies.

On the other hand, this sector is affected by geographical and environmental differences, which must be given due consideration.

There are, however, environmental differences and huge environment-related differences between the various countries.

Because of the environmental difference, the local fish populations will have developed different genetic adaptations.

However, environmental differences did create contrasts among the world's foragers.

Energy sources hold water, understanding the elements of climate and a tiny plant makes a big environmental difference.