Select the INCORRECT statement about Phylum Arthropoda.

The correct answer is Lignin is the main component of the exoskeletons of arthropods.Key Points

• Bacteria are a separate domain of life and are not related to the phylum Arthropoda.
• Arthropoda is the phylum that includes insects, spiders, crustaceans, and other similar creatures, all of which are multicellular and have exoskeletons, segmented bodies, and paired, jointed appendages. In contrast, bacteria are unicellular microorganisms in the domain Bacteria.

Additional InformationPhylum Arthropoda:

• Arthropods are the most diverse group of animals, representing over 80% of known living animal species.
• Arthropods are characterized by their jointed legs (from which their name derives: 'arthro' means jointed, 'pod' means legs) and a hard exoskeleton made primarily of chitin.
• The exoskeleton serves as both a protective structure and a surface for muscle attachment, but it also needs to be periodically shed and regrown through a process called molting as the animal grows.
• The specifics of the body plan vary between arthropods, but generally, they possess a segmented body divided into regions such as the head, thorax, and abdomen. Some species may have a fused head and thorax known as a cephalothorax.
• Arthropods have specialized, paired appendages. These are often adapted for roles including sensory reception, feeding, and locomotion.
• Arthropoda has a broad range of ecological roles, from insects pollinating flowers to spiders acting as predators.
• Arthropoda is further divided into several subgroups or classes, like Insecta (insects), Arachnida (spiders and scorpions), Myriapoda (centipedes and millipedes), and Crustacea (crabs, lobsters, shrimp).
• In contrast, bacteria refer to microscopic, single-celled organisms belonging to the domain Bacteria. They are completely separate from arthropods and represent one of the most basic forms of life. They have a cell wall but lack organized nuclei and other cell organelles.