The answer to 'what causes bee' is the presence of bees, which are attracted to certain environmental factors and resources. Bees are typically drawn to areas with abundant flowering plants, as they rely on nectar and pollen as a food source. They may also be attracted to sources of water, such as birdbaths or leaky faucets, as well as sheltered areas like cracks or crevices in walls or trees where they can build their hives.
The specific factors that attract bees to a particular location can vary depending on the species of bee, the time of year, and the local ecosystem. For example, honeybees may be drawn to suburban or urban areas with gardens and ornamental plants, while native bees may prefer more natural habitats with diverse native flora.