Provide three reasons for the decrease in the population of animals.
1. Climate change and the resulting droughts, floods, and storms.
2. Habitat loss due to human encroachment and destruction.
3. Over-exploitation of animals for food, fur, and other products.
1. Human activity such as hunting, fishing, and agriculture has decimated wildlife populations. 
2. Pollution and destruction of natural habitats also contributes to a decrease in animal populations. 
3. Climate change has caused an upheaval in the natural environment, making it difficult for animals to survive.