从广义上实验动物的环境因素如何分类？
参考答案：
1）气候因素如温度、湿度、气流、风速等。
2）物理、化学因素如氧、二氧化碳、粉尘、臭味、噪音、照明、杀虫剂、消毒剂、有害化学物质等。
3）居住因素如房屋、饲养笼具、垫料、给食器、供水器等。
4）营养因素如饲料、水。
5）生物因素，其中同种动物因素如社会地位、势力范围、咬斗，饲养密度等。异种生物因素如微生物、人、其他动物等。
Sam is a 9-year-old dog. He has a : painting. The hobby not only makes him famous, but also makes him . Sam has drawn 22 paintings. of them are abstract (抽象派的). He likes to start with darker colors moving on to lighter ones. Sam’s paintings are in the US. Some of them sell for $1,700. A woman even bought one a birthday gift for her dog. “He loves painting and always paints for hours,” said Sam’s owner, Mary. Sam was once a rescue (搜救) dog. One day, Mary wanted to teach him . “I dolphins paint and elephants paint , so I thought that maybe my dog could paint, too,” said Mary. She is right. Now Sam is one of the world’s animal artists. People call him “Da Vinci in the dog world”.
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