Phylum Arthropoda include organisms from the Class Insecta which are insects, Class Arachnida, which are spiders and Crustacea, which are lobsters, crabs, crayfish. There are others however, they all have an exoskeleton which is molted when they grow and jointed appendages. One example of how Arthropods are beneficial is in the role of insect pollinators. Without bees and other pollinators, flowering plants would have a difficult time with the transfer of pollen to the female pistil for fertilization to occur. Another way Arthropods are beneficial is in the role of scavengers. Many Crustaceans feed on dead organic matter or wastes. Examples of these types of scavengers are crabs. They help to remove debris from the ocean environment. Another example of how Arthropods are beneficial is that they are a major food source for other organisms. Insects, crabs, lobsters, shrimp, spiders, etc. are food to a variety of organisms. Krill, which are tiny crustaceans, are the major food source for many whales and a key member of the food chain in the Arctic region. Arthropods are very successful and have adapted to every biome on Earth.