Life experience tells us that when the weather is warm, seeds planted in wet and soft soil are easy to germinate. Why?

Warm weather provides suitable temperature for seed germination, while moist and soft soil provides appropriate water and sufficient air for seed germination. Therefore, "when the weather is warm, seeds planted in wet and soft soil are easy to germinate", because warm weather provides suitable temperature for seed germination, and wet and soft soil provides appropriate water and sufficient air for seed germination.

So the answer is: warm weather provides suitable temperature for seed germination, and moist and soft soil provides suitable water and sufficient air for seed germination.