A mammal is an animal that feeds its babies with milk when it is young. There are over 4,500 types of mammals.
Some animals and plants in our world are very common, like houseflies, cats or daisies. They are not in danger of dying out. Other species are very rare. Sometimes only a few of them are left. Such species may disappear forever.
Coffee is one of the most popular hot drinks in the world. Almost a third of the world’s population drinks coffee.
Amphibians are animals that live on land and in water. They were the ancestors of today’s reptiles and mammals and the first vertebrates to appear on land.
Introduction Blood is an important fluid that keeps us alive. We cannot live without it. The heart pumps blood to all parts of the body and brings them oxygen and food. At the same time blood carries all the substances we don’t need away from us. Blood fights infections, keeps our body temperature the same