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Toys and games
1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.
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兩栖類
Archaeology; Evolution
包含的類的脊椎動物的青蛙、 蟾蜍、 螈和蜥蜴。在泥盆紀 (約 3.7 億年前) 作為佔用土地的第一次脊椎動物進化的兩棲動物。他們有潮濕無鱗的皮膚,用來補充肺臟的氣體交換的 。的蛋都軟,容易乾燥,因此繁殖通常發生在水中。兩栖類幼蟲水生,,用鰓呼吸 ; 他們接受變態到成人的表單。在潮濕的環境中找到大多數兩栖類和它們發生除南極洲以外的所有大陸。 ...