What aspect of kin selection provides a fitness benefit?

Kin selection is a concept in evolutionary biology that explains how certain behaviors can evolve to aid the survival and reproductive success of an individual's relatives, thus providing indirect fitness benefits. The key aspect of kin selection is that by helping relatives, an individual can increase the likelihood that shared alleles will be passed on to future generations.

When an individual aids a relative, such as through cooperative breeding or caring for young, it enhances the survival chances of those relatives, thereby indirectly contributing to the individual's own genetic success. This is because relatives share a portion of their genes, and supporting them can lead to more copies of shared genes in the next generation.

The other aspects mentioned, such as group harmony, survival adaptation, and environmental interactions, do not specifically focus on the genetic relationships and indirect benefits that kin selection emphasizes. Instead, they pertain to broader ecological or social dynamics that may not directly enhance an individual's genetic legacy through relatedness.