Concept:Reproduction in animals occurs mainly through asexual or sexual means, not by forming spores.Explanation:Asexual reproduction is a valid animal method, e.g., fission in some invertebrates.Budding occurs in animals such as Hydra, producing new individuals from outgrowths.Sexual reproduction is the common method in most animals.Sporulation involves producing spores and is seen in fungi, bacteria, and protists, but not in animals.Answer:D. Sporulation