What is the yellow powder that bees spread known as?

The yellow powder that bees spread is known as pollen, which is a crucial part of the plant reproductive process. Pollen consists of tiny grains produced by the male parts of flowers (the anthers) and contains the male gametes (sperm cells) necessary for fertilizing the ovules in the female parts of flowers (the pistils). When bees visit flowers to collect nectar, they also collect pollen, which sticks to their bodies. As they move from flower to flower, they transfer this pollen, facilitating cross-pollination and ultimately supporting the formation of seeds and fruit.

This process not only aids in the reproduction of flowering plants but is also essential for a healthy ecosystem and the production of many crops that humans rely on for food. The other options relate to different concepts: pollution refers to harmful substances in the environment, filtration is a method used to separate solids from liquids, and carbon is a chemical element essential to life but not related to the function of bees in pollination. Pollen is, therefore, the correct answer as it specifically describes the substance associated with bees and their role in the ecosystem.