Pollution and habitat destruction can have severe effects on animal populations. Pollution can contaminate water sources, air, and soil, leading to health issues and even death in animals. It can also disrupt food chains and ecosystems, causing a decline in populations of certain species. Habitat destruction, such as deforestation or urban development, can displace animals from their natural habitats, reduce available resources like food and shelter, and increase competition for survival. This can lead to a decline in animal populations, loss of biodiversity, and even extinction of species. Overall, pollution and habitat destruction are significant threats to animal populations and their ecosystems.