Final answer:
For a sexually reproducing animal with limited mobility, hermaphroditism or external fertilization may be utilized; hermaphroditism allows self-fertilization or breeding with any individual, while external fertilization uses water currents to mix gametes.
Step-by-step explanation:
The question pertains to the type of reproduction a sexually reproducing animal with limited mobility might utilize. For such an animal, hermaphroditism could be a particularly useful reproductive strategy. Hermaphroditism means the animal possesses both male and female reproductive organs and can, therefore, self-fertilize or mate with any member of its species, which is advantageous for organisms with limited mobility. This strategy ensures that when an organism encounters a rare opportunity for reproduction, it can take full advantage of it without the need for a mate of the opposite sex.
Another potential reproductive strategy for animals with limited mobility is external fertilization, particularly in aquatic environments. In this scenario, the animal can release gametes into the water, relying on currents to mix sperm and eggs for fertilization. This method is particularly common among fish and amphibians, where the gametes will combine by chance in the water.