Final answer:
Sexual reproduction increases genetic diversity by combining genetic material from two individuals, resulting in offspring with unique genetic combinations.
Step-by-step explanation:
The reproduction strategy that increases genetic diversity is sexual reproduction. In sexual reproduction, the genetic material from two different individuals is combined, which leads to offspring that have different genetic combinations. This is in contrast to asexual reproduction methods such as binary fission or budding, where the offspring are genetically identical to the single parent. Sexual reproduction involves mechanisms like fertilization, which can happen internally or externally, and includes processes such as crossing over during meiosis, which further contributes to genetic variation. This genetic diversity is crucial for the adaptation and survival of species in changing environments.