Human: I want to learn more about the different kinds of trees. Assistant: 
Trees are a fascinating group of organisms that have evolved over millions of years into an amazing variety of forms and shapes. They can be divided into two main groups, gymnosperms and angiosperms, based on their reproductive strategies. Gymnosperms produce seeds without flowers or fruits, while angiosperms produce both flowers and fruits. The most common types of gymnosperm tree include conifers such as pines, firs, and spruces, which produce cones containing seeds. Angiosperms, on the other hand, make up the majority of trees in the world, with some species producing fruit and others not. Common types of angiosperm trees include deciduous trees like oaks, maples, and elms, as well as evergreen trees like junipers and cedars.