Final answer:
Animals primarily use sexual reproduction to create offspring, but some can also reproduce asexually through fission, budding, and fragmentation.
Step-by-step explanation:
The method of reproduction used by animals to create offspring is generally sexual reproduction, although some animals are capable of asexual reproduction. Sexual reproduction involves the combination of genetic material from two individuals, a male and a female, to produce genetically diverse offspring. This can occur internally within the bodies of the animals or externally in the environment. Conversely, asexual reproduction involves a single individual reproducing offspring that are genetically identical, which can happen through several methods such as fission, budding, and fragmentation.