Final answer:
Sexual reproduction is useful because it allows for greater genetic diversity and adaptability in offspring.
Step-by-step explanation:
During sexual reproduction, two separate cells from two individuals combine to form a genetically diverse third cell. This process is useful because it allows for greater genetic diversity and adaptability in the offspring. The genetic diversity of sexually produced offspring gives species a better chance of surviving in unpredictable or changing environments. While sexual reproduction may result in fewer offspring and require the presence of both males and females, the benefits of genetic diversity outweigh these drawbacks.