病原体是指能引起疾病的微生物。病原体可以是病毒、细菌、原生生物或真菌。 细菌感染的例子有霍乱、伤寒、食物中毒和淋病。而病毒感染的例子有流感（流行性感冒）、麻疹、腮腺炎、普通感冒和艾滋病。常见的皮肤真菌病有香港脚和体癣。疟疾就是原生动物病原体的一个例子。 加入我们的平台：www.fuseschool.org。 Twitter: https://twitter.com/fuseSchool 更深入的学习体验，请访问FuseSchool平台和应用：www.fuseschool.org。 向我们发送好友邀请：http://www.facebook.com/fuseschool 本开放教育资源是免费的，并采用知识共享许可协议进行许可。归属-非商业 CC BY-NC ( 见许可证文件：http://creativecommons.org/licenses/by-nc/4.0/ )。 您可以下载该视频用于非营利性、教育性目的。如果您想修改视频，请联系我们：info@fuseschool.org。 点击这里查看更多视频：https://alugha.com/FuseSchool
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Interest is the amount charged by a lender to a borrower. It means that if you borrow some money from a bank, you have to pay back more than the money you borrowed. Equally, if you have a savings account and deposit some money, the bank will pay you interest as a sort of thank you for saving with th
In this video we are going to look at a few different ways in which plant hormones can be used. Plant growth hormones (auxins) can be used as selective weedkillers. The selective weedkillers contain growth hormones, that cause the weeds to grow really quickly. This means the weed is absorbing nutr
Algebraic fractions are simply fractions with algebraic expressions either on the top, bottom or both. We treat them in the same way as we would numerical fractions. In this video we look at how to simplify algebraic fractions, and how to add and subtract them. VISIT us at www.fuseschool.org, wh
