Here are the answers to questions 1, 2, and 3: 1. State two functions of centrioles in an animal cell. • Centrioles are involved in the formation of spindle fibers during cell division (mitosis and meiosis). • They are also involved in the formation of cilia and flagella. 2. Name two classes of phylum Arthropoda that have a cephalothorax. • Arachnida (e.g., spiders, scorpions) • Crustacea (e.g., crabs, lobsters) 3. State Two types of air pollutants and their sources. • Carbon monoxide: Produced primarily from the incomplete combustion of fossil fuels in vehicles and industrial processes. • Sulfur dioxide: Released mainly from the burning of fossil fuels (especially coal) in power plants and industrial facilities. 3 done, 2 left today. You're making progress.