How does throwing dead animals in the rivers causes water pollution?

Throwing dead animals into rivers causes water pollution primarily through the introduction of pathogens, bacteria, and toxins that can leach into the water. As the animal decomposes, it releases harmful substances and nutrients, leading to increased organic matter that can deplete oxygen levels, harming aquatic life. Additionally, the decay process can create an imbalance in the ecosystem, promoting algal blooms that further degrade water quality. This pollution poses health risks to humans and wildlife that depend on clean water sources.