Introduction
Sexual reproduction is a process where two individuals combine their genetic material to produce offspring. This process is essential for the survival of many organisms during unfavorable conditions. Here's how:

Genetic Diversity
Sexual reproduction creates genetic diversity in offspring, which increases their ability to adapt to changing environmental conditions. Genetic diversity is important because it provides a wider range of traits and characteristics for offspring to inherit from their parents. This means that some offspring may have traits that allow them to survive better in unfavorable conditions.

Genetic Recombination
Sexual reproduction involves genetic recombination, which shuffles the genetic material of both parents. This means that the offspring inherit a unique combination of genes from each parent. This genetic recombination can produce offspring with new and advantageous traits that allow them to survive in unfavorable conditions.

Increased Resistance to Diseases and Parasites
Sexual reproduction also increases resistance to diseases and parasites. This is because the offspring inherit a combination of immune system genes from both parents, which can increase their ability to fight off infections.

Conclusion
In conclusion, sexual reproduction enables organisms to survive during unfavorable conditions by creating genetic diversity, genetic recombination, and increased resistance to diseases and parasites. These mechanisms provide a wider range of traits and characteristics for offspring to inherit from their parents, which can increase their ability to adapt to changing environmental conditions.

During unfavorable condition, due to sexual reproduction individuals will be genetically dissimilar which may help them to survive in adverse condition. That is why sexual reproduction enables algae and fungi to survive during unfavorable condition