Although scientists aren't exactly sure how all bees are able to work together to create and maintain their home, they know that most of the signals are given from the queen. The queen's pheromones give clues to worker bees about what tasks need to be performed. Pheromones tell workers to build wax, care for brood, forage and store supplies. They also warn the workers that the queen is ill and may need to be replaced. Worker bees also produce pheromones that create the very situation most people fear most: a bee attack. The brood (larvae and pupae of bees) also emit pheromones that tell the workers how old they are and what they need to eat. Pheromones appear to help bees manage each other, but most beekeepers agree that the queen bee is the most important bee in the hive. Although it can be usurped at any time if the colony decides it is weak or diseased, without a queen the hive will decline and die.