People are building more and more new homes and roads. They are cutting down more and more forests for lumber or farming. What do you think happens to the plants and animals that live on the land?
Often, they lose their habitats. A habitat is the environment where a plant or animal lives. When plants and animals lose their habitats, they may become endangered. They may even become extinct. We say that a plant or animal is endangered if there are very few of them left. If all of them die, we say it has become extinct.