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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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人工選擇
Archaeology; Evolution
人類繁殖動物和種植作物,確保未來幾代人有特定的理想特徵的過程。在人工挑選,飼養者在動物或植物的人口中選擇最理想的變種和有選擇地將他們養殖與其他適宜的個人。最馴化和農業物種的形式,都由人工選擇,也是一個重要的實驗技術研究演化。 ...