According to Encarta, the encyclopedia, civilization is a society with history and cultural unity and developed countries. Four early river associations in Mesopotamia, Egypt, China and India successfully met the requirements of what is called civilization. There are some similarities in these four civilizations, such as place, mind, government structure, written communication. That position played an important role in the development of these four civilizations.
Biodiversity River Basin: There are 3,000 freshwater fish species in the Amazon basin, which has the function of dispersing tree species. One of its main species, Piramutaba squid, Brachyplatystoma vaillantii, travels more than 3,300 km to the Andean tribal spawning grounds at a height of 400 m (1,300 ft) from the nurseries near the mouth of the Amazon River. . Genetic diversity: Populations of many species are geographically restricted to one or more wetland systems. This is because wetlands are usually physically long apart from other water sources. For example, the number of unique species of Lake Baikal in Russia divides it into biodiversity hot spots and is one of the most biologically diverse wetlands in the world. Research evidence by Mazepova et al.
Seeds are the main means of breeding trees, and the size and shape of the seeds are very different. Some of the largest species come from trees, but the largest tree, Sequoiadendron giganteum, produces one of the smallest tree species. The vast diversity of tree fruits and seeds reflects many different ways in which tree species evolve to disperse their offspring. To grow seedlings into adults, light is necessary. The competition between the focused seedlings and the mother's shadow may prevent it from prospering if the seed is only directly on the ground. Many species like white birch are small and have paper feathers that help to blow the wind away. Tonericola and maple trees have larger species, and when released, blade type wings rotate to the ground. Kapok tree has a cotton-like line to capture the breeze