Biodiversity is crucial for human existence in numerous ways. It aids in soil formation by contributing to the organic matter and structure of the soil. It also helps in preventing soil erosion as different types of plants and their root systems hold the soil together. Biodiversity plays a significant role in the recycling of waste as various organisms are involved in the decomposition process. Lastly, biodiversity is essential for the pollination of crops. Many insects, birds, and other animals that are part of biodiversity help in the transfer of pollen from the male part of the flower to the female part, leading to the production of fruits and seeds. Therefore, all the four given options are correct.