1. The problem asks to identify two reasons why fossils form an incomplete record of evolution. 2. Fossilization depends on specific conditions; not all organisms fossilize because soft tissues often decay before fossilization can occur. 3. Additionally, fossils can be miscategorized, but this is less about the incompleteness of the record and more about interpretation errors. 4. The correct reasons are: - Organisms do not fossilize if the conditions are wrong. - Soft tissues do not fossilize. 5. Other options like "Only dinosaurs can form fossils" are incorrect because many organisms can fossilize, and "Fossils of bones are not accurate" is misleading since bones can fossilize well. 6. Therefore, the incomplete fossil record is mainly due to the rarity of fossilization conditions and the inability of soft tissues to fossilize.